Lipase-catalyzed kinetic resolution of threo -configured 1,2-diols: a comparative study of transesterification versus hydrolysis
摘要:
The kinetic resolution of the alpha,beta-unsaturated vicinal diols 3 has been investigated by irreversible transesterification in organic media and by hydrolysis of the corresponding diacetates 6 (Scheme 1). The best results were obtained in the hydrolysis of the diacetates with the lipase CAL-B from Candida antarctica as a catalyst. (C) 1998 Elsevier Science Ltd. All rights reserved.
Mild Rhodium(III)-Catalyzed C–H Allylation with 4-Vinyl-1,3-dioxolan-2-ones: Direct and Stereoselective Synthesis of (<i>E</i>)-Allylic Alcohols
作者:Shang-Shi Zhang、Jia-Qiang Wu、Ye-Xing Lao、Xu-Ge Liu、Yao Liu、Wen-Xin Lv、Dong-Hang Tan、Yao-Fu Zeng、Honggen Wang
DOI:10.1021/ol503229c
日期:2014.12.19
A rhodium(III)-catalyzed C–H direct allylation reaction with 4-vinyl-1,3-dioxolan-2-ones has been developed. The reaction provides a facile and stereoselective access to substituted-(E)-allylic alcohols under mild and redox-neutral reaction conditions. Olefinic C–H activation is applicable, giving multifunctionalized skipped dienes in good yields. Minimal double-bond migration was observed.
作者:Lothar W. Habel、Sigrid De Keersmaecker、Joos Wahlen、Pierre A. Jacobs、Dirk E. De Vos
DOI:10.1016/j.tetlet.2004.03.157
日期:2004.5
A new route is outlined for preparation of vinyl 1,2-diketones via a three-step sequence. First, allylic alcohols are photooxidized by O-2 to hydroperoxides, which are reduced to vinyl 1,2-diols. These vinyl 1,2-diols are oxidized to vinyl 1,2-diketones with oxoammonium salts, which are prepared in situ from organic nitroxyl radicals. The new route is short, avoids the use of protecting groups, and is generally applicable to obtain aliphatic or aromatic vinyl 1,2-diketones. (C) 2004 Published by Elsevier Ltd.
Prevost, Annales de Chimie (Cachan, France), 1928, vol. <10>10, p. 357,378,389 Anm.
作者:Prevost
DOI:——
日期:——
Pudowik; Iwanow, Zhurnal Obshchei Khimii, 1956, vol. 26, p. 2768,2770;engl.Ausg.S.3083,3085
作者:Pudowik、Iwanow
DOI:——
日期:——
Ponomarew et al., Zhurnal Obshchei Khimii, 1957, vol. 27, p. 1226,1229; engl. Ausg. S. 1309, 1312