1,2,3-Triarylpropenones as starting materials for 2-pyridinethiones
作者:Esther Paniagua、María J. Rubio、Carlos Seoane、José L. Soto
DOI:10.1002/recl.19871061102
日期:——
2-Pyridinethiones 3 are obtained in good yields from 1,2,3-triarylpropenones 2 by treatment with cyanothioacetamide 1. Disulfides 4 result from oxydation of 3. Pyridinethiones 3 undergo methylation at the sulfur atom, leading to (methylthio)pyridines 5, which can be hydrolized to carboxamides 6. Thieno[2,3-b]pyridines 7 are obtained from 3 upon reaction with methyl chloroacetate.
Asymmetric Hydrogenation of Racemic Allylic Alcohols via an Isomerization–Dynamic Kinetic Resolution Cascade
作者:Kun Wang、Saisai Niu、Xin Guo、Weijun Tang、Dong Xue、Jianliang Xiao、Huaming Sun、Chao Wang
DOI:10.1021/acs.joc.1c02916
日期:2022.3.4
Prochiral racemic allylic alcohols are converted to enantioenriched chiral alcohols bearing adjacent stereocenters catalyzed by a diamine diphosphine Ru complex in the presence of tBuOK. The protocol features a broad substrate scope (56 examples) and high diastereo- and enantioselectivities (up to >99:1 dr, >99% ee) and could be applied to the synthesis of enantioenriched chromane and indane compounds