Synthesis of <i>meta</i>-(Indol-3-yl)phenols from Indoles and Cyclohexenone via Palladium(II)-Catalyzed Oxidative Heck Reaction and Dehydrogenative Aromatization in a One-Step Sequence
作者:Seung Hwan Son、Jeong-Won Shin、Hyuck-Jae Won、Hyung-Seok Yoo、Yang Yil Cho、Soo Lim Kim、Yoon Hu Jang、Boyoung Y. Park、Nam-Jung Kim
DOI:10.1021/acs.orglett.1c02679
日期:2021.10.1
with a wide substrate scope (a total of 25 compounds) via a palladium(II)-catalyzed oxidative Heckreaction and dehydrogenative aromatization in a one-step sequence is reported. This methodology affords a novel route for the privileged structures that are challenging to access via a direct link between indole and phenol, in a highly efficient and atom-economical manner.
据报道,通过钯 (II) 催化的氧化 Heck 反应和脱氢芳构化以一步顺序轻松构建具有广泛底物范围(总共 25 种化合物)的间-(吲哚-3-基)苯酚骨架。这种方法为通过吲哚和苯酚之间的直接链接以高效和原子经济的方式难以访问的特权结构提供了一种新途径。
Direct C–H Cyanation by ICN Formed <i>In Situ</i>: Nannozinone B
作者:Paul Wienecke、Hans-Dieter Arndt
DOI:10.1021/acs.orglett.3c00176
日期:2023.2.24
A novel method for C–H cyanation of different pyrans, pyrroles, indoles, and acyclic nucleophilic double bonds using TMSCN, NIS, and Zn(OTf)2 as a catalyst is described. The transformation is conducted under mild conditions tolerating a variety of functional groups. Zn(OTf)2 is likely to serve a dual catalytic role as an activator for TMSCN and for the cyanogen iodide generated in situ. Optimization
easily removed via visible light irradiation under mild conditions. We found that an excited phenolate-type photocatalyst efficiently transfers an electron to the benzene ring of benzyl-derived protecting groups to generate a phenyl radical anion. The benzyl C–N or C–O bond is then mesolytically cleaved by releasing a benzylradical. This method enables efficient deprotection of the benzyl group on amides