Asymmetric sp3 C–H functionalization via a chiral Brønsted acid-catalyzed redox reaction for the synthesis of cyclic aminals
摘要:
An organocatalytic asymmetric tandem 1,5-hydride transfer/ring closing reaction of o-aminobenzoketones with anilines to give cyclic aminals in fairly good diastereo- and enantioselectivities. (C) 2011 Elsevier Ltd. All rights reserved.
An efficient approach to chiral α-hydroxy acid esters by Lewis acid-mediated asymmetric [1,5]-hydride shift and isomerization of 2-(3-pyrroline-1-yl)arylketone acid ester has been achieved in up to 96% yield and 94% ee. This protocol would be applied in the synthesis of chiral α-hydroxy acid derivatives with simplicity and high enantioselectivity.
Controllable Synthesis of <i>N</i>-Heterocycles via Hydride Transfer Strategy-Enabled Formal [5 + 1] and [5 + 2] Cyclizations
作者:Ying Dong、Fangzhi Hu、Huixin Wu、Feng-Wei Guo、Liang Wang、Feng-Yu Du、Shuai-Shuai Li
DOI:10.1021/acs.orglett.3c03986
日期:2024.1.12
The Brønsted acid-controlled switchable synthesis of indoline-fused tetrahydroquinolines and indole-fused benzazepines was developed through hydride transfer-enabled formal [5 + 1] and [5 + 2] cyclization reactions from indoles and N-alkyl o-aminobenzoketones. Indoline, furanone, and tetrahydroquinoline hybridized pentacyclic products were unprecedentedly accessed via a cascade condensation/hydride