Protecting group migration in the chemistry of 1-t-butyldimethylsilyl-4-hydroxymethyl-2-azetidinone
作者:Stéphane Gérard、Jacqueline Marchand-Brynaert
DOI:10.1016/s0040-4039(03)01525-9
日期:2003.8
The alkoxide anion derived from 1-t-butyldimethylsilyl-4-hydroxymethyl-2-azetidinone (1) rearranged at −78°C into amide anion by N–O migration of the silyl protecting group. The occurrence of this intermediate was proved by quenching with benzyl bromide and phenethyl chloroformate, giving respectively N-benzyl (4) and N-(phenethyloxycarbonyl) (6) derivatives of 4-(t-butyldimethylsilyloxy)methyl-2-azetidinone
由1-叔丁基二甲基甲硅烷基-4-羟甲基-2-氮杂环丁酮(1)衍生的醇盐阴离子在甲硅烷基保护基团的N–O迁移下于-78°C重排为酰胺阴离子。通过用苄基溴和氯甲酸苯乙酯淬灭证明该中间体的存在,分别得到4-(叔丁基二甲基甲硅烷氧基)甲基-2-氮杂环丁酮的N-苄基(4)和N-(苯乙氧基羰基)(6)衍生物。