作者:Emily R. T. Robinson、Charlene Fallan、Carmen Simal、Alexandra M. Z. Slawin、Andrew D. Smith
DOI:10.1039/c3sc50199j
日期:——
The asymmetric annulation of a range of α,β-unsaturated acyl ammonium intermediates, formed from isothiourea HBTM 2.1 and anhydrides with either 1,3-dicarbonyls, β-ketoesters or azaaryl ketones gives either functionalised esters (upon ring opening), dihydropyranones or dihydropyridones in good yields (up to 93%) and high enantioselectivity (up to 97% ee).
Rhodium-Catalyzed Decarbonylative Direct Olefination of Arenes with Vinyl Carboxylic Acids
作者:Ruiying Qiu、Lingjuan Zhang、Conghui Xu、Yixiao Pan、Hongze Pang、Lijin Xu、Huanrong Li
DOI:10.1002/adsc.201401020
日期:2015.4.13
A rhodium(I)‐catalyzed direct CH bond olefination of pyridyl‐substituted arenes with readily available vinyl carboxylic acids has been realized. This reaction occurred efficiently without the need for any external oxidant, affording the ortho‐olefinated products in high yields and excellent regioselectivities. Diversely substituted vinyl carboxylic acids behaved as efficient olefination reagents under