The first intermolecular asymmetric Michael addition of nitrogen-nucleophiles to alpha,beta-unsaturated carboxylic acids was achieved through a new type of arylboronic acid equipped with chiral aminothiourea. The use of BnONH2 as a nucleophile gives a range of enantioenriched beta-(benzyloxy)amino acid derivatives in good yields and with high enantioselectivity (up to 90% yield, 97% enantiomeric excess
氮亲核试剂向α,β-不饱和
羧酸的首次分子间不对称迈克尔加成反应是通过配备手性
氨基
硫脲的新型芳基
硼酸实现的。使用BnONH2作为亲核试剂,可以以高收率和高对映选择性(高达90%的收率,97%的对映体过量(ee))获得一系列对映体富集的β-(苄氧基)
氨基酸衍
生物。将获得的产物有效地转化为旋光性β-
氨基酸和1,2-二胺衍
生物。