Stereoselective grignard reactions to α-amino nitrones. Synthesis of optically active α-aminohydroxylamines and 1,2-diamines
作者:Pedro Merino、Ana Lanaspa、Francisco L. Merchan、Tomas Tejero
DOI:10.1016/s0957-4166(97)00250-4
日期:1997.7
α-Aminohydroxylamines are formed stereoselectively from the nucleophilic addition of phenylmagnesium bromide to α-amino nitrones. In contrast, the addition of methylmagnesium bromide occurs in a stereorandom fashion. Nevertheless it is possible to achieve a complete syn selectivity by diprotecting the α-amino group in the starting nitrone. Hydrogenation of the obtained α-amino hydroxylamines followed
α-氨基羟胺是由苯基溴化镁向α-氨基硝酮的亲核加成立体选择性形成的。相反,甲基溴化镁的添加以立体随机方式发生。然而,通过对起始硝酮中的α-氨基进行双保护可以实现完全的顺式选择性。氢化获得的α-氨基羟胺,然后脱保护叔丁氧羰基,得到旋光的1,2-二胺。