Substituent-Guided Palladium-Ene Reaction for the Synthesis of Carbazoles and Cyclopenta[<i>b</i>]indoles
作者:Sonu Yadav、Raju Hazra、Animesh Singh、S. S. V. Ramasastry
DOI:10.1021/acs.orglett.9b00410
日期:2019.5.3
palladium-catalyzed intramolecular Trost–Oppolzer type Alder-ene strategy was developed for the synthesis of carbazoles and cyclopenta[b]indoles from easily accessible(3-allyl-1H-indol-2-yl)methyl acetates. This strategy was extended for the synthesis of naphthalenes and dibenzobenzofurans as well. In addition, a short synthesis of antibacterial and antifungal natural product glycozoline and its analogues was also
开发了一种有效的钯催化的分子内Trost-Oppolzer型Alder-ene策略,用于从易于获得的(3-烯丙基-1 H-吲哚-2-基)乙酸甲酯合成咔唑和环戊[ b ]吲哚。该策略也扩展到了萘和二苯并呋喃的合成中。另外,还实现了抗菌和抗真菌天然产物糖唑啉及其类似物的短合成。
Transition-Metal-Free Decarboxylative Propargylic Substitution/Cyclization with either Azolium Enolates or Acyl Anions
作者:Shenci Lu、Jun-Yang Ong、Si Bei Poh、Terence Tsang、Yu Zhao
DOI:10.1002/anie.201801340
日期:2018.5.14
unprecedented transition‐metal‐free propargylic substitution reaction with either azoliumenolates or acyl anions, which are generated from aldehydes under N‐heterocyclic carbene catalysis. This new catalytic activation operates on readily available cyclic propargylic carbamates through decarboxylation, and generates reactive allene intermediates that can undergo divergent cyclization pathways to deliver
Synthesis of polysubstituted cyclopenta[b]indoles via relay gold(<scp>i</scp>)/Brønsted acid catalysis
作者:Seema Dhiman、S. S. V. Ramasastry
DOI:10.1039/c4cc08174a
日期:——
various polysubstituted cyclopentannulated indoles from easily accessible 1-(2-aminophenyl)prop-2-ynols and readily available 1,3-dicarbonyls has been developed. In an unprecedented event, the intermediate 2-indolylmethyl cations undergo the cation-Ene reaction with various 1,3-dicarbonyls followed by an intramolecular Friedel-Crafts-type reaction generating functionalized cyclopenta[b]indoles.
One-pot relay catalysis: divergent synthesis of furo[3,4-b]indoles and cyclopenta[b]indoles from 3-(2-aminophenyl)-1,4-enynols
作者:Manisha Manisha、Seema Dhiman、Jopaul Mathew、S. S. V. Ramasastry
DOI:10.1039/c6ob00319b
日期:——
Described herein is an efficient divergent strategy for the synthesis of furo[3,4-b]indoles via a sequential Ag(I)/Bi(III)/Pd(II) catalysis and cyclopenta[b]indoles via a one-pot Ag(I)/Brønsted acid relay catalysis from 3-(2-aminophenyl)-4-pentenyn-3-ols, accessible in three simple steps from 2-aminobenzaldehydes.
本文描述了一种有效的发散策略,用于通过顺序的Ag(I)/ Bi(III)/ Pd(II)催化合成呋喃并[3,4- b ]吲哚和通过一锅Ag合成环戊[ b ]吲哚(I)/ 3-(2-氨基苯基)-4-戊烯-3-醇的布朗斯台德酸中继催化,可通过三个简单的步骤从2-氨基苯甲醛获得。
Synthesis of Sulfonylated Heterocycles via Copper‐Catalyzed Heteroaromatization/Sulfonyl Transfer of Propargylic Alcohols
作者:Xinyi Chen、Andrey Shatskiy、Jian‐Quan Liu、Markus D. Kärkäs、Xiang‐Shan Wang
DOI:10.1002/asia.202001126
日期:2021.1.4
An unprecedented copper‐catalyzed heteroaromatization/sulfonyl transfer of propargylicalcohols with isocyanide has been developed. 3‐Sulfonyl benzofurans and indoles were produced under Cu(I) catalysis in good to high yields. The developed catalytic methodology provides controlled, modular, and facile access to sulfonyl benzoheterocycle scaffolds.