Stereoselective reduction of chiral 3-(p-tolylsulfinyl)-2-thienyl ketones with diisobutylaluminum hydride (DIBAL) or lithium tri-sec-butylborohydride (L-Selectride) has been achieved. Reduction of the ketones with DIBAL in the presence of a Lewis acid or with L-Selectride afforded predominantly the thienyl carbinols, while the reduction with DIBAL alone gave the other diastereoisomeric alcohols as the major product. This method has been successfully applied to an efficient route to chiral thienyl alcohols.
使用
二异丁基铝
氢化物(D
IBAL)或
锂三-sec-丁基
硼氢化物(L-Selectride)对手性3-(
对甲苯基亚磺酰基)-2-
噻吩酮进行选择性还原已取得成功。在
路易斯酸存在的情况下,使用D
IBAL对酮进行还原或使用L-Selectride可以主要得到
噻吩基碳醇,而单独使用D
IBAL进行还原则主要得到其他非对映体醇。这一方法已成功应用于高效合成手性
噻吩醇的路线。