A flexible enantioselective synthesis of (+)-centrolobine and 5-epi-diospongin-A using asymmetric transfer hydrogenation/tandem Grubbs cross-metathesis/oxy-Michael reaction as key steps
作者:Gullapalli Kumaraswamy、Dasa Rambabu
DOI:10.1016/j.tetasy.2013.01.005
日期:2013.2
An efficient enantioselective synthesis of (+)-centrolobine and 5-epi-diospongin-A was achieved by the use of asymmetric transfer hydrogenation (ATH)/tandem Grubbs cross-metathesis/oxy-Michael reaction. Furthermore, this strategy allows for diastereodivergent access to every representative member of the family. (C) 2013 Elsevier Ltd. All rights reserved.
US7534905B2
申请人:——
公开号:US7534905B2
公开(公告)日:2009-05-19
The Mukaiyama type aldol reaction for the synthesis of <i>trans</i>-2,6-disubstituted tetrahydropyrans: synthesis of diospongin A and B
作者:Yada Bharath、Utkal Mani Choudhury、N. Sadhana、Debendra K. Mohapatra
DOI:10.1039/c9ob01549c
日期:——
An efficient synthesis protocol for the preparation of trans-2,6-disubstituted tetrahydropyrans by the reaction of 1-phenyl-1-triemthylsiloxyethylene with six membered cyclic hemiacetals in the presence of iodine is developed. This reaction proceeds smoothly under mild conditions employing a catalytic amount of molecular iodine. The feature of this novel conversion includes milder reaction conditions