Synthesis of the C1–C27 portion of the aplyronines
摘要:
This manuscript describes the use of the anti,anti-diastereoselective aldol reaction of an efficiently generated dipropionate equivalent to construct the C-5-C-14-portion of the aplyronines. This portion was then coupled with a compound corresponding to C-15-G(20) of the targets. Further elaboration and an additional coupling led to an intermediate containing C-1-C-27 with appropriate stereochemistry and functionalization for eventual conversion into the aplyronines. (C) 2004 Elsevier Ltd. All rights reserved.
Synthesis of the C1–C27 portion of the aplyronines
作者:Michael A Calter、Jianguang Zhou
DOI:10.1016/j.tetlet.2004.04.159
日期:2004.6
This manuscript describes the use of the anti,anti-diastereoselective aldol reaction of an efficiently generated dipropionate equivalent to construct the C-5-C-14-portion of the aplyronines. This portion was then coupled with a compound corresponding to C-15-G(20) of the targets. Further elaboration and an additional coupling led to an intermediate containing C-1-C-27 with appropriate stereochemistry and functionalization for eventual conversion into the aplyronines. (C) 2004 Elsevier Ltd. All rights reserved.
Catalytic, Asymmetric Synthesis and Diastereoselective Aldol Reactions of Dipropionate Equivalents
作者:Michael A. Calter、Wei Song、Jianguang Zhou
DOI:10.1021/jo035668l
日期:2004.2.1
methylketene can be conveniently prepared in one step and high enantiomeric excess from propionyl chloride, using a catalytic amount of a silylated cinchona alkaloid as a source of chirality. Opening of the dimer with a lithiated sulfonamide affords a β-ketosulfonimide, which undergoes Sn(II)-mediated aldol reactions to diastereoselectively afford the anti,syn-aldol adduct. Alternatively, reduction of the dimer