Asian Journal of Organic Chemistry最新文献_第9页

Trifluoromethylation Strategies of Alcohols and Phenols 醇和酚的三氟甲基化策略

IF 2.8 4区化学

Asian Journal of Organic Chemistry Pub Date : 2024-07-15 DOI: 10.1002/ajoc.202400179

Ravi Pratap Singh, Tanay Ghoshal, Vivek Mishra

引用次数: 0

Front Cover: Total Synthesis of Eutyscoparol A and Violaceoid C (Asian J. Org. Chem. 7/2024) 封面：Eutyscoparol A 和 Violaceoid C 的全合成（《亚洲有机化学杂志》，第 7/2024 期）

IF 2.8 4区化学

Asian Journal of Organic Chemistry Pub Date : 2024-07-15 DOI: 10.1002/ajoc.202480701

Dr. Takatsugu Murata, Takuto Iwayama, Teppei Kuboki, Shotaro Taguchi, Shou Tsugawa, Takumi Yoshida, Hisazumi Tsutsui, Ayana Shimauchi, Yukiho Kosaka, Prof. Isamu Shiina

引用次数: 0

Approach to Spirocyclohexadienes via Visible Light‐Mediated ipso‐Cyclization of Amino Acid Derivatives with N‐(2‐Phenyl)benzoyl Groups 通过可见光介导的 N-(2-苯基)苯甲酰基氨基酸衍生物异环生成螺环己二烯的方法

IF 2.8 4区化学

Asian Journal of Organic Chemistry Pub Date : 2024-07-01 DOI: 10.1002/ajoc.202400140

引用次数: 0

Construction of Polymers with Highly Dispersed Reactive Phases and Open Pores for Catalyzing the Efficient Synthesis of CO2 to α‐Methylene Cyclic Carbonates 构建具有高度分散活性相和开放孔隙的聚合物，用于催化 CO2 与 α-亚甲基环碳酸盐的高效合成

IF 2.8 4区化学

Asian Journal of Organic Chemistry Pub Date : 2024-07-01 DOI: 10.1002/ajoc.202400087

{"title":"Construction of Polymers with Highly Dispersed Reactive Phases and Open Pores for Catalyzing the Efficient Synthesis of CO2 to α‐Methylene Cyclic Carbonates","authors":"","doi":"10.1002/ajoc.202400087","DOIUrl":"10.1002/ajoc.202400087","url":null,"abstract":"<div>Selective capture of carbon dioxide as a C1 feedstock for the preparation of high‐value chemicals has been recognised as an important way to mitigate the crisis. In this work, a new heterogeneous catalyst, Cu@CP‐PII, was developed through the rational construction of an open‐pore organic skeleton, which is easy to synthesise and highly efficient. With the synergistic effect between the high CO2 affinity of the porous skeleton and the highly dispersed Cu(I) sites of the activated alkynes, it can be used for the efficient preparation of α‐methylene cyclic carbonates at ambient temperature and pressure. The structure and morphology were exhaustively characterised by Solid State 13C‐NMR, FT‐IR, XPS, TEM and N2 adsorption‐desorption tests, and this catalyst possessed a high surface area of 273.7 m2 ⋅ g−1 and uniformly dispersion of CuI. To test its catalytic activity, Cu@CP‐PII in an amount of only 0.4 mol% was used as a catalyst for the carboxylative cyclization reaction of propargylic alcohols with CO2, which resulted in substrate conversions up to 100 % and yields greater than 99 %. In addition, controlled experiments and mechanistic elucidation confirmed that anhydrous and low temperatures are necessary to achieve high selective control of the target product α‐methylene cyclic carbonates.</div>","PeriodicalId":130,"journal":{"name":"Asian Journal of Organic Chemistry","volume":"13 7","pages":"Article e202400087"},"PeriodicalIF":2.8,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140579949","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Methyl‐ and Methoxy‐substituted 2‐(Pyridin‐2‐yl)‐4‐(4‐aminophenyl)quinazolines: Synthesis and Photophysical Properties 甲基和甲氧基取代的 2-(吡啶-2-基)-4-(4-氨基苯基)喹唑啉：合成与光物理性质

IF 2.8 4区化学

Asian Journal of Organic Chemistry Pub Date : 2024-07-01 DOI: 10.1002/ajoc.202400135

{"title":"Methyl‐ and Methoxy‐substituted 2‐(Pyridin‐2‐yl)‐4‐(4‐aminophenyl)quinazolines: Synthesis and Photophysical Properties","authors":"","doi":"10.1002/ajoc.202400135","DOIUrl":"10.1002/ajoc.202400135","url":null,"abstract":"<div>A series of novel 2‐(2‐pyridyl)quinazoline luminophores containing a donor aryl fragment at position 4 and methyl or methoxy groups at benzene ring has been synthesized by efficient three‐step route. The linear optical properties have been studied by UV/Vis absorption and photoluminescence spectra in two solvents. We revealed that introduction of additional methyl group or the replacement of methyl substituents with methoxy ones lead to sequentially shift of absorption and emission maximum to blue region. 9H‐Carbazol‐9‐yl‐containing derivative is characterized by hypsochromically shifted absorption band compared to its NEt2 and NPh2 counterparts. Unlike 9H‐carbazol‐9‐yl‐derivative, Et2N‐ and Ph2N‐bearing quinazolines demonstrate considerable decrease in quantum yield values when going from toluene to MeCN. Solvatochromic properties have been explored, the pronounced bathochromic shift was observed in fluorescence spectra with the increase of solvents polarity. Moreover, the compounds show significant shift of emission band with the increase of water fraction in DMSO/H2O mixture. Two‐photon optical properties have been also studied, the two‐photon absorption cross‐sections in MeCN and toluene reached 120 GM and 210 GM, respectively. The presence of additional methyl group has little impact on δTPA value, while introduction of methoxy substituents dramatically decreases TPA cross sections. Additionally, a quantum‐chemical calculations of synthesized compounds were performed to support the experimental data.</div>","PeriodicalId":130,"journal":{"name":"Asian Journal of Organic Chemistry","volume":"13 7","pages":"Article e202400135"},"PeriodicalIF":2.8,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140579972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Recent Advances in Denitrogenative Organic Transformations of 1,2,3‐Benzotriazin‐4(3H)‐ones 1,2,3-苯并三嗪-4(3H)-酮变性有机转化的最新进展

IF 2.8 4区化学

Asian Journal of Organic Chemistry Pub Date : 2024-07-01 DOI: 10.1002/ajoc.202400127

{"title":"Recent Advances in Denitrogenative Organic Transformations of 1,2,3‐Benzotriazin‐4(3H)‐ones","authors":"","doi":"10.1002/ajoc.202400127","DOIUrl":"10.1002/ajoc.202400127","url":null,"abstract":"<div>Denitrogenative organic transformations and related reactions are a class of significant approaches for carrying out unusual C−C/C‐heteroatom (C−O, C−N, C−S) bond‐forming reactions that are usually promoted by Ru, Ir, Pd, Ni, and Cu metal catalysts. In this trait, numerous methods were adopted to synthesize several pharmaceutically valuable N‐ and O‐containing heteroaromatics using 1,2,3‐benzotriazin‐4(3H)‐one as an electrophilic coupling partner. This review involves the recent achievements related to the metal/organo‐catalyzed thermal and visible‐light mediated denitrogenative approaches with 1,2,3‐benzotriazin‐4(3H)‐ones towards the synthesis of imperative N‐heteroaromatic compounds. In addition, metal and oxidant‐free ortho‐functionalization of benzotriazinones by using suitable nucleophilic partners have been discussed. In particular, the most novel methods employing Ni and Pd metal catalysts that have emerged are exhibited. Specific attention has been paid to offering the detailed mechanistic pathway to explain the role of metal catalysts and the mechanism in the absence of metal catalysts in the denitrogenative reactions under a thermal/visible light medium.</div>","PeriodicalId":130,"journal":{"name":"Asian Journal of Organic Chemistry","volume":"13 7","pages":"Article e202400127"},"PeriodicalIF":2.8,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140966292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Methanesulfonic Acid‐Catalyzed Friedel‐Crafts Alkylation: Towards Sustainable Synthesis of Arylalkanes from Donor–Acceptor Cyclopropane Ketones 甲磺酸催化的 Friedel-Crafts 烷基化反应：从供体-受体环丙烷酮实现芳基烷烃的可持续合成

IF 2.8 4区化学

Asian Journal of Organic Chemistry Pub Date : 2024-07-01 DOI: 10.1002/ajoc.202400116

引用次数: 0

Selective Hydrogenation of Unsaturated Vinyl Ethers in Two‐Chamber Gauge‐Reactor 双室规整反应器中不饱和乙烯基醚的选择性氢化反应

IF 2.8 4区化学

Asian Journal of Organic Chemistry Pub Date : 2024-07-01 DOI: 10.1002/ajoc.202400147

{"title":"Selective Hydrogenation of Unsaturated Vinyl Ethers in Two‐Chamber Gauge‐Reactor","authors":"","doi":"10.1002/ajoc.202400147","DOIUrl":"10.1002/ajoc.202400147","url":null,"abstract":"<div>A pressure gauge was incorporated into a two‐chamber glass H‐tube to continuously monitor the pressure inside a reactor when working with gases. The ex situ generated H2, D2, acetylene and CO2 were tested in pressure gauge reactors, and calibration curves were plotted. A series of unsaturated compounds with two or more double C=C bonds accessible for hydrogenation were synthesized for hydrogenation. The hydrogenation proceeded well due to constant pressure control, and the desired products were isolated in good yields. The same hydrogenation procedures were then carried out using steel autoclaves to verify the results and compare them. Surprisingly, almost the same results were obtained, confirming the effectiveness of self‐made glass reactors. The hydrogenation mechanism was further investigated using D‐labeled reagents. The kinetics of hydrogenation was studied both in manometric glass reactors and in steel autoclaves, which showed a similar nature of the main process in both reaction units. Thus, the created reactors can be effectively used in barometric transformations instead of steel autoclaves in appropriate cases.</div>","PeriodicalId":130,"journal":{"name":"Asian Journal of Organic Chemistry","volume":"13 7","pages":"Article e202400147"},"PeriodicalIF":2.8,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140931832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An Efficient Synthesis of α‐Sulfonamide Phosphonates through Metal‐Free Three‐Component Reaction 通过无金属三组分反应高效合成α-磺酰胺膦酸盐

IF 2.8 4区化学

Asian Journal of Organic Chemistry Pub Date : 2024-07-01 DOI: 10.1002/ajoc.202400100

引用次数: 0

Synthesis of Azahelicenes via Friedel‐Crafts‐Type Ring‐Closing Reaction of Axially Chiral Compounds 通过轴向手性化合物的 Friedel-Crafts 型闭环反应合成氮杂环烯

IF 2.8 4区化学

Asian Journal of Organic Chemistry Pub Date : 2024-07-01 DOI: 10.1002/ajoc.202400128

引用次数: 0