as a catalyst. This method was used to obtain a series of chiral α-sulfonyl-β-aminophosphonates in yields of up to 96% with 89:11 dr and 88% ee. These compounds were further transformed into β-aminophosphonates or chiral azetidines with various functional groups by a Horner–Wadsworth–Emmons/aza-Michael addition reaction sequence.
通过使用手性
金鸡纳
生物碱衍生的
硫脲作为催化剂,开发了 N-保护的 α-砜与 β-苯磺酰基
膦酸酯的有效对映选择性曼尼希反应。该方法用于获得一系列手性 α-磺酰基-β-
氨基膦酸酯,产率高达 96%,dr 为 89:11,ee 为 88%。这些化合物通过 Horner-Wadsworth-Emmons/aza-Michael 加成反应序列进一步转化为具有各种官能团的 β-
氨基膦酸酯或手性氮杂
环丁烷。