A straightforward approach to both enantiomers of zearalane is described from the enantiomerically pure alkenol (S)-4, prepared by a kinetic enzymatic resolution of the racemate. The key step is a Pd-catalyzed cross-coupling of an arene trifluoromethanesulfonate with a 9-alkyl-9-borabicyclo[3.3.1]nonane derivative. The two enantiomers 2a and 2b have been obtained in an enantiodivergent manner by macrolactonization
从对映体纯烯醇 (S)-4 描述了一种直接的方法来处理玉米赤霉烯的两种对映异构体,该烯醇 (S)-4 通过外消旋体的动力学酶拆分制备。关键步骤是 Pd 催化的
芳烃三氟甲磺酸酯与 9-烷基-9-
硼双环 [3.3.1]
壬烷衍
生物的交叉偶联。两种对映异构体 2a 和 2b 已通过羟基酸 (S)-7 的大环内酯化与 Corey 内酯化的 Gerlach 修饰或 Mitsunobu 内酯化以对映发散方式获得。