aziridines and cyclopropanes (see scheme, PTC=phase-transfer catalyst, Ts=toluene-4-sulfonyl) in good yield with moderate to high d.r. and high ee values using tosylhydrazone salts with catalytic quantities of chiral sulfide (5-20 mol %) and metal catalyst (1 mol %). The process is particularly suited to the synthesis of conformationally locked cyclopropyl amino acids, which can now be prepared in only
亚胺和
烯烃可以使用
甲苯磺酰hydr盐催化催化转化,以良好的收率将其转化为相应的
氮丙啶和
环丙烷(参见方案,
PTC =相转移
催化剂,Ts =
甲苯-4-磺酰基),并具有中等至高的dr和高ee值。手性
硫化物(5-20mol%)和
金属
催化剂(1mol%)。该方法特别适合于构象锁定的环丙基
氨基酸的合成,其现在仅需三步就可从市售材料中以100%ee的形式制备。