Organocatalytic enantioselective formal synthesis of bromopyrrole alkaloids via aza-Michael addition
作者:Su-Jeong Lee、Seok-Ho Youn、Chang-Woo Cho
DOI:10.1039/c1ob06078c
日期:——
An unprecedented organocatalyticenantioselective formal synthesis of bromopyrrole alkaloid natural products is reported. An organocatalytic aza-Michael additionusing pyrroles as the N-centered nucleophile is utilized as the enantioselective step to construct the nitrogen-substituted stereogenic carbon center in bromopyrrole alkaloids in good yield and excellent enantioselectivity. The aza-Michael
Diverse Site-Selective Transformation of Benzylic and Allylic Silyl Ethers via Organocatalytic Oxidation
作者:Shohei Hamada、Kaori Sakamoto、Eri Miyazaki、Elghareeb E. Elboray、Yusuke Kobayashi、Takumi Furuta
DOI:10.1021/acscatal.3c01153
日期:2023.6.16
the electronic properties of silylethers, thus enabling selective oxidation of benzylic and allylic silylethers, despite steric factors. A subsequent one-pot reduction accomplishes the formal deprotection to the corresponding benzylic and allylic alcohols. This catalytic system allows the direct oxidative desymmetrization of bis-benzylic and bis-allylic silylethers to access synthetically useful
Cinchona-based primary amine-catalyzed enantioselective aza-Michael reactions of pyrroles with α,β-unsaturated aldehydes
作者:Su-Jeong Lee、Jun-Gi Ahn、Chang-Woo Cho
DOI:10.1016/j.tetasy.2014.09.002
日期:2014.10
The cinchona-based primary amine-catalyzed enantioselective aza-Michael reaction of alpha,beta-unsaturated aldehydes with 4,5-dihalo-1H-pyrrole-2-carbonitriles as the N-centered heteroaromatic nucleophile, followed by chemoselective reduction provided the corresponding chiral aza-Michael products in good yields and with excellent enantioselectivities (90-97% ee). (C) 2014 Elsevier Ltd. All rights reserved.