A Short and Efficient Diastereoselective Synthesis of 2′-Substituted 2- Cyclopropylglycines
作者:Jürgen Zindel、Armin de Meijere
DOI:10.1055/s-1994-25436
日期:——
Diastereomerically pure 2-cyclopropylglycines 2, 2′-substituted with an electron-withdrawing group, were prepared in two steps by Michael addition of the glycine equivalent 2-(diphenylmethyleneamino)acetate 11 to various Michael acceptors of type 1 with subsequent γ-elimination of bromide and followed by acid mediated deprotection.
以电子吸引基团取代的立体异构体纯的2-环丙基甘氨酸2,采用两步法制备,首先通过迈克尔加成反应将甘氨酸等价物2-(二苯甲亚胺)乙酸酯11与各种类型1的迈克尔受体反应,随后进行γ-消除溴化物反应,最后通过酸催化去保护。