Enantioselective Hydroazidation of Trisubstituted Non-Activated Alkenes
作者:Daniel Meyer、Philippe Renaud
DOI:10.1002/anie.201703340
日期:2017.8.28
A one-pot procedure for the enantioselective hydroazidation of non-activated trisubstituted alkenes is described. Hydroboration with monoisopinocampheylborane (IpcBH2) provides dialkylboranes that are in situ selectively converted into monoalkyl-substituted catecholboranes; these undergo radical azidation upon treatment with benzenesulfonyl azide and a radical initiator. Enantiomerically enriched azides
We report herein the facile and practical construction of α,β-unsaturatedketones via rhodium-catalyzed direct acylation of vinylsilanes with readily available and abundant carboxylic acids. This protocol features access to a diverse array of synthetically useful functionalities with moderate to excellent yields. More importantly, the late-stage functionalization of pharmaceuticals was also realized
PhI(OAc) 2 -mediated decomposition of N -arylsulfonyl hydrazones: metal-free synthesis of ( E )-vinyl sulfones
作者:Zaigang Luo、Yuyu Fang、Yu Zhao、Xuemei Xu、Chengtao Feng、Zhong Li、Xiaomei Zhang、Jie He
DOI:10.1016/j.tetlet.2016.07.099
日期:2016.9
preparing of (E)-vinylsulfones via PhI(OAc)2-mediated decomposition of ketone-derived N-arylsulfonyl hydrazones has been developed. The generation of α- or β-substituted vinylsulfones was affected by the steric hindrance at β-position of the substrates. This transformation provides an environment-friendly and important complementary strategy for the synthesis of various (E)-vinylsulfones.