Diastereoselective Aldolization of α-Aminonitriles. Diastereoselective Synthesis of β-Amino Alcohols and β,γ-Diamino Alcohols
作者:Eric Leclerc、Emmanuel Vrancken、Pierre Mangeney
DOI:10.1021/jo025872t
日期:2002.12.1
They are transformed into syn,anti-protected beta,gamma-diamino alcohols by a two-step procedure, involving addition of a Grignard reagent and reduction. The cleavage of the N-tert-butyl group is achieved by a simple acidic treatment. The application of this methodology to chiral, nonracemic aldehydes is studied. Starting from D-isopropylideneglyceraldehyde, an anti, anti, syn, anti-(2R,3S,4S,5R,6R)-diaminotriol
通过将锂化的N-苄基-N-叔丁基氨基乙腈加到醛中进行的醛醇缩合提供了非对映体纯的抗β-羟基-α-氨基腈。通过两步法将它们转化为顺式,抗保护的β,γ-二氨基醇,包括添加格氏试剂并还原。N-叔丁基的裂解是通过简单的酸性处理实现的。研究了该方法在手性,非外消旋醛上的应用。从D-异亚丙基甘油醛开始,以可接受的收率和良好的非对映选择性制备抗,抗,顺,抗-(2R,3S,4S,5R,6R)-二氨基三醇。