lactam as a new chiral building block for alkaloid synthesis. Lipase-catalyzed kinetic resolution of hydroxylactam 8, followed by isolation–racemization of the chiral acetoxylactam 9 provided the optically pure hydroxylactam 8 in 96.0% yield with >99% ee after five cycles of kinetic resolution–racemization process. Chemical transformation of (S)-hydroxylactam 8 furnished chiral (−)-2-epi-lentiginosine
我们已经开发了一种实用的手性内酰胺合成方法,作为
生物碱合成的新手性结构单元。羟基内酰胺的
脂肪酶催化的动力学拆分8,随后手性acetoxylactam的隔离外消旋化9提供的光学纯的羟基内酰胺8动力学拆分外消旋化过程的五个周期后在96.0%的产率> 99%ee的。(
化学转化小号)-hydroxylactam 8布置手性( - ) - 2-外延-lentiginosine(1)在20%的产率在10步,没有对映体过量的损耗。