preparation of polysubstituted α- or β-amino acids. With the intention of preparing α,α-disubstituted α- or β-amino acids, regioselective electrophilic substitution of aziridino-γ-lactones at C2 was realized using two different methods. In the first, the anion was generated at C2 with LDA in the presence of the electrophilic agent. In the second method, the anion was trapped with TMS. Subsequent treatment
2,3-
叠氮基-γ-内酯是用于制备多取代的α-或β-
氨基酸的通用合成子。为了制备α,α-二取代的α-或β-
氨基酸,使用两种不同方法实现了C 2上
叠氮基-γ-内酯的区域选择性亲电取代。首先,在亲电子试剂的存在下,
LDA在C2生成阴离子。在第二种方法中,阴离子被TMS捕获。随后用
氟离子源处理C2甲
硅烷基化产物,使阴离子再生,然后阴离子与各种亲电试剂进行原位反应。通过第一种方法制备的C2苄基衍
生物的分子内
氮丙啶开环允许获得新的
呋喃衍
生物,所述
呋喃衍
生物是α,α-二取代的β-
氨基酸的直接前体。