functionalized tricyclic lactone 1 was obtained in optically pure form by the sulfoximine-mediated resolution of the enone methyl acetal 3. The absolute configuration of (−)-3 and consequently of (+)-1, was determined by the transformation of (−)-3 into (−)-5, a known intermediate in the total synthesis of forskolin (2) and confirmed by application of the high field FT NMR Mosher method to alcohol 6.
通过
磺胺嘧啶介导的烯酮甲基
缩醛3的拆分,以光学纯净的形式获得了高度官能化的
三环内酯1。(-)- 3的绝对构型,以及(+)- 1的绝对构型,是通过将(-)- 3转化为(-)- 5(福斯高林(2)的总合成中已知的中间体)而确定的,并得到了证实通过应用高场傅里叶变换核磁共振Mosher方法对
酒精6。