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Journal of The Chemical Society-perkin Transactions 1最新文献

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Palladium(0) catalysed and copper(I) promoted reactions of the secondary zinc reagent derived from L-threonine 钯(0)催化和铜(I)促进了l -苏氨酸衍生的二次锌试剂的反应
Journal of The Chemical Society-perkin Transactions 1 Pub Date : 2002-12-19 DOI: 10.1039/B208667K
Ian J. Wilson, R. Jackson
{"title":"Palladium(0) catalysed and copper(I) promoted reactions of the secondary zinc reagent derived from L-threonine","authors":"Ian J. Wilson, R. Jackson","doi":"10.1039/B208667K","DOIUrl":"https://doi.org/10.1039/B208667K","url":null,"abstract":"C-3 epimeric secondary zinc reagents 2a/b were prepared from either diastereoisomeric iodide 3a or 3b using DMF as solvent, and characterised by 1H NMR methods. Palladium catalysed cross couplings and copper promoted allylations yielded protected β-methyl substituted amino acids.","PeriodicalId":17267,"journal":{"name":"Journal of The Chemical Society-perkin Transactions 1","volume":"178 1","pages":"2845-2850"},"PeriodicalIF":0.0,"publicationDate":"2002-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79947471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
A new tricyclic ring and a nitrogen–sulfur analogue of the tri-pentagon bowl: cycloaddition reactions of the unstablised 1,3,4-thiadiazolium-3-methanide 1,3-dipole: steric influences on the endo-effect: substituted pyrrolo[2,1-b]-1,3,4-thiadiazole systems: azolium 1,3-dipoles 一个新的三环和三五边形碗的氮硫类似物:不稳定的1,3,4-噻二唑-3-甲烷-1,3偶极的环加成反应:对内效应的立体影响:取代吡咯[2,1-b]-1,3,4-噻二唑体系:唑1,3偶极
Journal of The Chemical Society-perkin Transactions 1 Pub Date : 2002-12-19 DOI: 10.1039/B208544P
R. N. Butler, G. Smyth, P. McArdle, D. Cunningham
{"title":"A new tricyclic ring and a nitrogen–sulfur analogue of the tri-pentagon bowl: cycloaddition reactions of the unstablised 1,3,4-thiadiazolium-3-methanide 1,3-dipole: steric influences on the endo-effect: substituted pyrrolo[2,1-b]-1,3,4-thiadiazole systems: azolium 1,3-dipoles","authors":"R. N. Butler, G. Smyth, P. McArdle, D. Cunningham","doi":"10.1039/B208544P","DOIUrl":"https://doi.org/10.1039/B208544P","url":null,"abstract":"1,3,4-Thiadiazolium-3-methanide 1,3-dipole 6 and the 2,5-diphenyl and 2,5-dimethyl derivatives, 4 and 5, were generated at −60 °C in dichloromethane. Cycloaddition reactions with substituted alkenes gave many new derivatives of the pyrrolo[2,1-b][1,3,4]thiadiazole ring system. The first examples of a bowl-shaped tricyclic nitrogen-sulfur analogue of the tripentagon bowl, a 3,4,10-triaza-6-thiatricyclo[6,3,0,03,7]undecane ring system were obtained from N-substituted maleimide dipolarophiles. The reactions displayed predominantly endo-stereochemistry but with decreasing size of the substituent at the incipient 7a-fusion bridgehead in the cycloaddition transition state, the extent of exo-cycloaddition increased. The cycloadduct endo \u0000∶ \u0000exo ratio was reduced from exclusively endo to ca. 2 ∶ 1 on changing the 1,3-dipole from the 2,5-diphenyl derivative 4 to the unsubstituted case 6. X-Ray crystal structures are reported for 2,7a-diphenyl-5,6,7,7a-tetrahydropyrrolo[2,1-b][1,3,4]thiadiazole-endo-6,7-N-methyldicarboxyimide 7a, 2,7a-diphenyl-5,6,7,7a-tetrahydropyrrolo[2,1-b][1,3,4]thiadiazole-endo-6,7-N-phenyldicarboxyimide 9e and 2,7a-diphenyl-5,6,7,7a-tetrahydropyrrolo[2,1-b][1,3,4]thiadiazole-7-endo-carbonitrile 13.","PeriodicalId":17267,"journal":{"name":"Journal of The Chemical Society-perkin Transactions 1","volume":"65 1","pages":"2851-2860"},"PeriodicalIF":0.0,"publicationDate":"2002-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89832220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Fluorination of α-phenylsulfanyl esters using difluoroiodotoluene 用二氟碘甲苯氟化α-苯基磺酰酯
Journal of The Chemical Society-perkin Transactions 1 Pub Date : 2002-12-19 DOI: 10.1039/B209079A
W. Motherwell, M. Greaney, D. Tocher
{"title":"Fluorination of α-phenylsulfanyl esters using difluoroiodotoluene","authors":"W. Motherwell, M. Greaney, D. Tocher","doi":"10.1039/B209079A","DOIUrl":"https://doi.org/10.1039/B209079A","url":null,"abstract":"Treatment of α-phenylsulfanyl esters 11–14 with one equivalent of difluoroiodotoluene 3a produced the α-fluoro sulfides 17–20 in good overall yield through a Fluoro-Pummerer reaction. A second equivalent of reagent produced α,α-difluoro sulfides and a third led to α,α-difluoro sulfoxides. An identical pattern of reactivity was observed with the α-phenylsulfanyl lactone 26. This sequential fluorination–oxidation behaviour was exploited in the one-pot synthesis of 3-fluoro-2(5H)-furanone 33 starting from α-phenylsulfanylbutyrolactone 32.","PeriodicalId":17267,"journal":{"name":"Journal of The Chemical Society-perkin Transactions 1","volume":"58 1","pages":"2809-2815"},"PeriodicalIF":0.0,"publicationDate":"2002-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91003173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 19
The Sharpless asymmetric aminohydroxylation Sharpless不对称氨基羟基化
Journal of The Chemical Society-perkin Transactions 1 Pub Date : 2002-12-19 DOI: 10.1039/B111276G
J. Bodkin, M. McLeod
{"title":"The Sharpless asymmetric aminohydroxylation","authors":"J. Bodkin, M. McLeod","doi":"10.1039/B111276G","DOIUrl":"https://doi.org/10.1039/B111276G","url":null,"abstract":"","PeriodicalId":17267,"journal":{"name":"Journal of The Chemical Society-perkin Transactions 1","volume":"1 1","pages":"2733-2746"},"PeriodicalIF":0.0,"publicationDate":"2002-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89391634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 153
A facile route to pyrroles, isoindoles and hetero fused analogues 一个简单的途径，以吡咯，异吲哚和杂合类似物
Journal of The Chemical Society-perkin Transactions 1 Pub Date : 2002-12-19 DOI: 10.1039/B209255G
C. Gabbutt, J. Hepworth, B. Heron, Samantha L. Pugh
{"title":"A facile route to pyrroles, isoindoles and hetero fused analogues","authors":"C. Gabbutt, J. Hepworth, B. Heron, Samantha L. Pugh","doi":"10.1039/B209255G","DOIUrl":"https://doi.org/10.1039/B209255G","url":null,"abstract":"Enamino acids derived from 1,2-dimethylaminomethylene- or 1,2-hydroxymethylene-carbonyl compounds and amino acids undergo a decarboxylative cyclisation to pyrroles, isoindoles and other fused pyrroles. A two atom ring expansion occurs preferentially with enamino acids from cyclohexane-1,3-diones and α-alkyl-α-amino acids leading to oxocino[2,3-c]pyrroles.","PeriodicalId":17267,"journal":{"name":"Journal of The Chemical Society-perkin Transactions 1","volume":"45 1","pages":"2799-2808"},"PeriodicalIF":0.0,"publicationDate":"2002-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88298042","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 16
Photoreduction induced by electron transfer from di- and trialkylamines to the triplet state of nitronaphthalenes in polar media 极性介质中由二烷基胺和三烷基胺到硝基萘三重态的电子转移引起的光还原
Journal of The Chemical Society-perkin Transactions 1 Pub Date : 2002-12-17 DOI: 10.1039/B107328C
H. Görner, D. Döpp
{"title":"Photoreduction induced by electron transfer from di- and trialkylamines to the triplet state of nitronaphthalenes in polar media","authors":"H. Görner, D. Döpp","doi":"10.1039/B107328C","DOIUrl":"https://doi.org/10.1039/B107328C","url":null,"abstract":"The photoinduced reactions of 1- and 2-nitronaphthalene (1- and 2-NN) and 1-methoxy-4-nitronaphthalene (MNN) in the presence of DABCO, triethylamine (TEA) and diethylamine (DEA) in neat acetonitrile and acetonitrile–water were studied by UV–vis spectroscopy and conductometry upon excitation by ns laser pulses at 354 nm. The rate constant of quenching of the nitronaphthalene triplet state by the amines is close to the diffusion-controlled limit in deoxygenated acetonitrile and smaller (kq \u0000≊ 2 × 109 M−1 s−1) in the presence of water (5 M). Electron transfer yields the nitronaphthalene radical anions which were observed as secondary transients with maxima at 390 nm. At higher TEA or DEA concentrations (>1 mM) nitronaphthalene radicals are formed in a second, delayed event by reduction of the nitronaphthalene ground state involving the α-aminoalkyl radicals. The nitronaphthalene radicals react via second-order termination yielding nitrosonaphthalenes and further products. The photoinduced electron transfer and subsequent radical disproportionation reactions are supported by time-resolved conductometric measurements. The mechanism of the two-step reduction reactions in the presence of TEA or DEA and the effects of amine concentration, oxygen and water are discussed.","PeriodicalId":17267,"journal":{"name":"Journal of The Chemical Society-perkin Transactions 1","volume":"28 1","pages":"120-125"},"PeriodicalIF":0.0,"publicationDate":"2002-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74521543","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Dendrimer–cyclodextrin assemblies as stabilizers for gold and platinum nanoparticles 树状聚合物-环糊精组合物作为金和铂纳米颗粒的稳定剂
Journal of The Chemical Society-perkin Transactions 1 Pub Date : 2002-12-17 DOI: 10.1039/B108026A
J. Michels, J. Huskens, D. Reinhoudt
{"title":"Dendrimer–cyclodextrin assemblies as stabilizers for gold and platinum nanoparticles","authors":"J. Michels, J. Huskens, D. Reinhoudt","doi":"10.1039/B108026A","DOIUrl":"https://doi.org/10.1039/B108026A","url":null,"abstract":"Aqueous assemblies of adamantyl-derivatized poly(propylene imine) (PPI) dendrimers and B-cyclodextrin (B-CD) have been used as nanoreactors in the preparation of gold and platinum nanoparticles in water. These particles have been formed by the reduction of aurate or platinate anions in the presence of the generation 4 (4·(B-CD)32) and 5 ( 5·(B-CD)40) assemblies. Lower generation assemblies did not provide stable nanoparticles. A kinetic model is proposed in which the particles form inside the dendrimer assemblies owing to preferred nucleation as a result of the electrostatic attraction between the polycationic core and the metallate anions. The persistent shape of the adamantyl-derivatized dendrimers and the dense shell of adamantyl-B-CD complexes provide a kinetic barrier for nanoparticle escape thus prolonging their lifetime. Exchange of the dendrimers for a cationic disulfide provided stable, water-soluble metal nanoparticles without change of their size distribution.","PeriodicalId":17267,"journal":{"name":"Journal of The Chemical Society-perkin Transactions 1","volume":"56 1","pages":"102-105"},"PeriodicalIF":0.0,"publicationDate":"2002-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84462012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
High-resolution electron momentum spectroscopy of molecules 分子的高分辨率电子动量谱
Journal of The Chemical Society-perkin Transactions 1 Pub Date : 2002-12-17 DOI: 10.1039/B100700I
M. Brunger, W. Adcock
{"title":"High-resolution electron momentum spectroscopy of molecules","authors":"M. Brunger, W. Adcock","doi":"10.1039/B100700I","DOIUrl":"https://doi.org/10.1039/B100700I","url":null,"abstract":"","PeriodicalId":17267,"journal":{"name":"Journal of The Chemical Society-perkin Transactions 1","volume":"87 1","pages":"1-22"},"PeriodicalIF":0.0,"publicationDate":"2002-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85940375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Ring closure synthetic strategies toward buckybowls: benzannulation versus cyclopentannulation 环闭合合成策略对巴克碗:苯环与环戊环
Journal of The Chemical Society-perkin Transactions 1 Pub Date : 2002-12-17 DOI: 10.1039/B108030J
T. C. Dinadayalane, U. Priyakumar, G. Sastry
{"title":"Ring closure synthetic strategies toward buckybowls: benzannulation versus cyclopentannulation","authors":"T. C. Dinadayalane, U. Priyakumar, G. Sastry","doi":"10.1039/B108030J","DOIUrl":"https://doi.org/10.1039/B108030J","url":null,"abstract":"Computations were performed on idealized retrosynthetic routes towards two model buckybowl compunds, sumanene (I) and pinakene (II). Two possible paths for sumanene (I) and six for pinakene (II) were analyzed. The computational results unequivocally predict that benzannulation is a significantly easier process compared to cyclopentannulation in the ring closure strategies in both cases. The suitability of the theoretical models for obtaining reliable trends is assessed and generalizations for the synthetic strategies directed towards buckybowls and C60 were made.","PeriodicalId":17267,"journal":{"name":"Journal of The Chemical Society-perkin Transactions 1","volume":"2015 1","pages":"94-101"},"PeriodicalIF":0.0,"publicationDate":"2002-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73392614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Selective transport of potassium ions across a planar phospholipid bilayer by a calix[4]arene-crown-5 as a synthetic carrier 钾离子在平面磷脂双分子层上通过杯状[4]芳烃冠-5作为合成载体的选择性运输
Journal of The Chemical Society-perkin Transactions 1 Pub Date : 2002-12-17 DOI: 10.1039/B106153B
T. Jin
{"title":"Selective transport of potassium ions across a planar phospholipid bilayer by a calix[4]arene-crown-5 as a synthetic carrier","authors":"T. Jin","doi":"10.1039/B106153B","DOIUrl":"https://doi.org/10.1039/B106153B","url":null,"abstract":"The ion transport ability in a planar phospholipid bilayer, of two p-tert-butylcalix[4]arene-crown-5 derivatives (1, 2), a p-tert-butylcalix[5]arene ester 3, dibenzo-18-crown-6, and valinomycin have been investigated using a voltage clamp method. Membrane current measurements showed that the synthetic calixarene ionophores except for dibenzo-18-crown-6, show ion transport activities for K+ in the bilayer membranes. The order of K+ transport activities of the compounds was valinomycin >1 > 3 > 2. From the measurements of reversal potentials, the relative ion permeability across the bilayer was determined for 1, 3 \u0000and valinomycin. Both 1 and 3 showed ion transport selectivity for K+, while valinomycin showed ion transport selectivity for Rb+. Among the calixarene ionophores, compound 1 showed the highest K+ conductivity and K+/Na+ selectivity. Although the K+/Na+ selectivity of 1 is less than that of valinomycin by a factor of ca. 2, calix[4]arene-based ionophore 1 has the potential for use as a synthetic K+ carrier in phospholipid bilayer membranes.","PeriodicalId":17267,"journal":{"name":"Journal of The Chemical Society-perkin Transactions 1","volume":"71 1","pages":"151-154"},"PeriodicalIF":0.0,"publicationDate":"2002-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87776566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
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