Asymmetric Synthesis of anti- and syn-2,3-Diamino Esters Using Sulfinimines. Water and Concentration Effects
摘要:
In the absence of water, an excess of the lithium enolate of N-(diphenylmethylene)glycine ethyl ester (4) adds to sulfinimines to give syn-2,3-diamino esters 6, and in the presence of water, this enolate gives the anti-2,3-diamino esters 5. These unusual results are interpreted in terms of those factors that inhibit the retro-Mannich fragmentation in the diamino esters.
Asymmetric Synthesis of anti- and syn-2,3-Diamino Esters Using Sulfinimines. Water and Concentration Effects
摘要:
In the absence of water, an excess of the lithium enolate of N-(diphenylmethylene)glycine ethyl ester (4) adds to sulfinimines to give syn-2,3-diamino esters 6, and in the presence of water, this enolate gives the anti-2,3-diamino esters 5. These unusual results are interpreted in terms of those factors that inhibit the retro-Mannich fragmentation in the diamino esters.
Asymmetric Synthesis of <i>anti</i>- and <i>syn</i>-2,3-Diamino Esters Using Sulfinimines. Water and Concentration Effects
作者:Franklin A. Davis、Yanfeng Zhang、Hui Qiu
DOI:10.1021/ol063058c
日期:2007.3.1
In the absence of water, an excess of the lithium enolate of N-(diphenylmethylene)glycine ethyl ester (4) adds to sulfinimines to give syn-2,3-diamino esters 6, and in the presence of water, this enolate gives the anti-2,3-diamino esters 5. These unusual results are interpreted in terms of those factors that inhibit the retro-Mannich fragmentation in the diamino esters.