作者:Manfred T. Reetz、Marcus Hübel、Ralf Jaeger、Renate Schwickardi、Richard Goddard
DOI:10.1055/s-1994-25559
日期:——
α-Amino acids 1 are readily converted into the corresponding N, N-dibenzylamino aldehydes 2 which in turn serve as starting materials for enantiomerically pure α- N,N-dibenzylamino aldimines 5, 6 and 7 having benzyl, tosyl and trimethylsilyl groups, respectively, at the aldimine nitrogen atom. All three classes of chiral aldimines undergo stereoselective Lewis acid promoted Me3SiCN addition reactions with non-chelation controlled formation of the corresponding α,β-diamino nitriles. All of the reaction sequences occur without any racemization.
α-氨基酸1很容易转化为相应的N, N-二苄氨基醛2,这些醛又作为起始材料用于制备具有苄基、甲苯磺酰基和三甲基硅基的立体异构纯α-N, N-二苄氨基亚胺5、6和7。所有这三类手性亚胺都能在非配位控制的条件下,通过Lewis酸催化选择性的Me3SiCN加成反应,形成相应的α,β-二氨基腈。整个反应过程都没有发生消旋化。