利用先进的核磁共振技术区分某些吲唑类和吡唑并吡啶的 N-烷基异构体。

IF 1.9 3区化学 Q3 CHEMISTRY, MULTIDISCIPLINARY

Magnetic Resonance in Chemistry Pub Date : 2024-07-14 DOI:10.1002/mrc.5471

Fatima Doganc, Hakan Göker

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引用次数: 0

摘要

吲唑支架有两种可相互转化的同分异构形式。在 DMF 中的碱性条件（K2CO3）下，测定了一些非取代和取代吲唑的 N-苄基化和烷基化的区域选择性。N1:N2 之间出现的区域异构体的比例几乎相等。通过结合 NOESY 和 1H-13C/15N HMBC NMR 方法确定了它们的结构。此外，吡唑并[3,4-b]吡啶还有三种可能的同分异构体形式；主要是 1H 和 2H，7H 异构体很少见。吡唑并[4,3-b]吡啶迄今只已知两种可能的同分异构体形式：1H 和 2H。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Differentiation of regioisomeric N-alkylation of some indazoles and pyrazolopyridines by advanced NMR techniques

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Differentiation of regioisomeric N-alkylation of some indazoles and pyrazolopyridines by advanced NMR techniques

Indazole scaffold have two interconvertible tautomeric forms. Regioselectivities were determined for N-benzylations and alkylation of some non-substituted and substituted indazoles, under basic conditions (K₂CO₃) in DMF. The ratio of regioisomers occurrence between N¹:N² is almost equal. Their structures were established through a combination of NOESY and ¹H-¹³C/¹⁵N HMBC NMR methods. Additionally, pyrazolo[3,4-b]pyridines have also three possible tautomeric forms; primarily 1H and 2H, with 7H isomers being rare. Pyrazolo[4,3-b]pyridines have only known two possible tautomeric forms so far; 1H and 2H.

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来源期刊

Magnetic Resonance in Chemistry 化学-光谱学

CiteScore

4.70

自引率

10.00%

发文量

审稿时长

1 months

期刊介绍： MRC is devoted to the rapid publication of papers which are concerned with the development of magnetic resonance techniques, or in which the application of such techniques plays a pivotal part. Contributions from scientists working in all areas of NMR, ESR and NQR are invited, and papers describing applications in all branches of chemistry, structural biology and materials chemistry are published. The journal is of particular interest not only to scientists working in academic research, but also those working in commercial organisations who need to keep up-to-date with the latest practical applications of magnetic resonance techniques.