Asymmetric synthesis of syn and anti methyl 2,3-diamino-3-phenylpropanoate derivatives from N-substituted imines and Schöllkopf's bislactim ether
作者:Giuseppe Cremonesi、Piero Dalla Croce、Maddalena Gallanti、Concetta La Rosa
DOI:10.1016/j.tet.2014.01.040
日期:2014.3
(2R)-Schöllkopf's bislactim ether was studied: the azaenolate addition to imines followed by hydrolysis of the resulting adducts gave syn-(2S,3R) and anti-(2S,3S)-methyl 2,3-diamino-3-phenylpropanoate derivatives in good yields. The configurations of the newly formed stereocenters of α,β-diamino acids were assigned on the basis of the 1H NMR analysis and by comparison with known products. The diastereoisomeric
不同的反应Ñ取代benzaldimines和(2 - [R )- Schöllkopf的bislactim醚进行了研究:该azaenolate除了亚胺,然后将所得加合物的水解都给顺式- (2-小号,3 - [R )和反- (2-小号,3S)-2,3-二氨基-3-苯基丙酸甲酯衍生物具有良好的收率。在1的基础上分配了新形成的α,β-二氨基酸立体中心的构型1 H NMR分析并与已知产物比较。考虑到存在于亚胺氮上的取代基对过渡态稳定性的影响,解释了非对映异构体比率。该方法代表了立体选择性合成α,β-二氨基酸的新方法。