1,3-Dipolar Cycloadditions of Carbonyl Ylides to Aldimines: Scope, Limitations and Asymmetric Cycloadditions
作者:Staffan Torssell、Peter Somfai
DOI:10.1002/adsc.200600324
日期:2006.11
The development of a diastereoselective 1,3-dipolar cycloaddition of carbonyl ylides and imines for the synthesis of α-hydroxy-β-amino esters is described. The methodology is successfully applied to chiral α-methylbenzylimines affording enantiomerically pure syn-β-amino alcohols, which is exemplified with a short asymmetric synthesis of the paclitaxel side-chain. The use of chiral Rh(II) carboxylate
描述了用于合成α-羟基-β-氨基酯的羰基化物和亚胺的非对映选择性的1,3-偶极环加成的发展。该方法成功地应用于手性α-甲基苄基亚胺,提供对映体纯的顺式-β-氨基醇,以紫杉醇侧链的短时不对称合成为例。用于催化对映选择性1,3-偶极环加成的开发中使用的手性铑(II)羧酸盐的催化剂也被描述,得到顺式-β-氨基在适度的对映体纯度(醇ER高达82:18)。