Practical Stereo- and Regioselective, Copper(I)-PromotedStrecker Synthesis of Sugar-Modifiedα,β-Unsaturated Imines
作者:Guobin Zhou、Weixin Zheng、Dong Wang、Pengfei Zhang、Yuanjiang Pan
DOI:10.1002/hlca.200690054
日期:2006.3
The regio- and stereoselective, Lewis acid catalyzed Strecker reaction between Me3SiCN and different aldimines incorporating a 2,3,4,6-tetrakis-O-pivaloyl-D-glucopyranosyl (Piv4Glc) chiral auxiliary has been worked out. Depending on the conditions used, high yields (up to 95%) and good diastereoselectivities (de > 86%) were achieved under mild conditions (Table 1), especially with CuBr ⋅ Me2S as catalyst
已经研究出Me 3 SiCN与掺入2,3,4,6-四-O-新戊酰基-D-吡喃葡萄糖基(Piv 4 Glc)手性助剂的不同醛亚胺之间的区域和立体选择性路易斯酸催化的Strecker反应。根据所使用的条件,在温和的条件下(表1),尤其是使用CuBr·Me 2 S作为催化剂时,可以实现高收率(高达95%)和良好的非对映选择性(de> 86%)。我们的协议允许随时准备不对称的β,γ-不饱和α-氨基酸,例如(R)-2-氨基-4-苯基丁-3-烯酸(13 ;方案2)及其同类物。