The effects of C–S and C–Se bonds on torquoselectivity: stereoselective olefination of α-thio and α-selenoketones with ynolates
摘要:
Highly Z-selective olefination of acyclic alpha-thio and alpha-selenoketones with ynolates has been achieved, and the theoretical calculations of the transition states in the ring-opening of the intermediates, the beta-lactone enolates, revealed that the torquoselectivity was controlled by the secondary orbital interactions between the sigma orbital of the C-S bond or a lone pair orbital on the S and sigma* orbitals of the breaking C-O bond, and the sigma orbital of the breaking C-O bond or a lone pair orbital on the O on the ring and the sigma* orbitals of the C-S bond. The synthetic applications of the resulting olefins are also shown. (c) 2009 Elsevier Ltd. All rights reserved.
Electrophilic substitutions with the electrogenerated sulfenium cation R1-S+
作者:Quang Tho Do、Driss Elothmani、Georges Le Guillanton
DOI:10.1016/s0040-4039(98)00871-5
日期:1998.6
The sulfenium cation R1-S+ electrogenerated by oxidation of organic disulfides, reacts with phenols, aromatic ethers and ketones bearing an hydrogen atom in α position, to give alkyl (aryl) sulfanyl compounds.
The effects of C–S and C–Se bonds on torquoselectivity: stereoselective olefination of α-thio and α-selenoketones with ynolates
作者:Takashi Yoshikawa、Seiji Mori、Mitsuru Shindo
DOI:10.1016/j.tet.2009.08.060
日期:2009.10
Highly Z-selective olefination of acyclic alpha-thio and alpha-selenoketones with ynolates has been achieved, and the theoretical calculations of the transition states in the ring-opening of the intermediates, the beta-lactone enolates, revealed that the torquoselectivity was controlled by the secondary orbital interactions between the sigma orbital of the C-S bond or a lone pair orbital on the S and sigma* orbitals of the breaking C-O bond, and the sigma orbital of the breaking C-O bond or a lone pair orbital on the O on the ring and the sigma* orbitals of the C-S bond. The synthetic applications of the resulting olefins are also shown. (c) 2009 Elsevier Ltd. All rights reserved.