chiral thiophosphoramide to afford exclusively the thermodynamically favoured diastereomer. This novel secondary amine-thiophosphoramide has proven to be an effective bifunctional organocatalyst for the asymmetric Michael addition of cyclohexanone to both aryl- and alkyl-substituted nitro olefins. The corresponding adducts were obtained with excellent diastereo- (up to >99:1 dr) and enantioselectivities
在手性柔性联
苯酚衍生的新型手性
硫代
磷酰胺的制备中观察到从 (S)-2-(
氨基甲基)
吡咯烷到tropos
联苯骨架的手性转移,以专门提供热力学有利的非对映异构体。这种新型仲胺
硫代
磷酰胺已被证明是一种有效的双功能有机催化剂,可用于
环己酮与芳基和烷基取代的硝基烯烃的不对称迈克尔加成反应。获得了具有出色非对映选择性(高达 >99:1 dr)和对映选择性(高达 >99% ee)的相应加合物。