AlEt3-promoted eliminative ring-opening of β-hydroxy epoxides: highly stereoselective synthesis of terminal α-hydroxy olefins
摘要:
AlEt3-promoted eliminative ring-opening of beta-epoxy alcohols leading to alpha-hydroxy olefins is reported. This eliminative ring-opening reaction is shown to be highly stereoselective, thus providing an alternative asymmetric synthesis for a-hydroxy olefins. (C) 2003 Elsevier Ltd. All rights reserved.
Rhodium-Catalyzed Regio- and Enantioselective Allylic Amination of Racemic 1,2-Disubstituted Allylic Phosphates
作者:Wen-Bin Xu、Minghe Sun、Mouhai Shu、Changkun Li
DOI:10.1021/jacs.1c04016
日期:2021.6.9
Alkynylphosphines are rarely used as ligands in asymmetric metal catalysis. We synthesized a series of chiral bis(oxazoline)alkynylphosphine ligands and used them in Rh-catalyzed highlyregio- and enantioselectiveallylicamination reactions of 1,2-disubstituted allylic phosphates. Chiral 1,2-disubstituted allylic amines were synthesized in up to 95% yield with >20:1 branched/linear (b/l) ratio and
Aerobic epoxidation of tertiary allylic alcohols remains a significant challenge. Reported here is an efficient and highly chemoselective copper‐catalyzed epoxidation and semipinacol rearrangement reaction of tertiary allylic alcohols with molecular oxygen. The solvent 1,4‐dioxane activates dioxygen, thereby precluding the addition of a sacrificial reductant.
Novel conversion of epoxides to one carbon homologated allylic alcohols by dimethylsulfonium methylide
作者:L. Alcaraz、J.J. Harnett、C. Mioskowski、J.P. Martel、T. Le Gall、Dong-Soo Shin、J.R. Falck
DOI:10.1016/s0040-4039(00)73522-2
日期:1994.7
The reaction of excess of dimethylsulfoniummethylide with terminal, allylic, or benzylic epoxides affords good to excellent yields of one carbon homologated allylic alcohols.