Ti(IV)-promoted reaction of the chiral acetals derived from aromatic aldehydes with l-(tri-n-butyl)stannyl-2,3-butadiene followed by removal of the chiral auxiliary gave aryl(1,3-butadien-2-yl)methanols with high enantiomeric purity (>90% ee). The synthetic utility of this method was demonstrated by the formal synthesis of (-)-sporochnol A, a terpene possessing a chiral benzylic quaternary carbon center
Ti(IV)-促进衍生自芳族醛的手性缩醛与 L-(三正丁基)甲锡基-2,3-丁二烯反应,然后去除手性助剂,得到芳基 (1,3-butadien-2-)对映体纯度高 (>90% ee) 的甲醇。该方法的合成效用通过 (-)-sporochnol A 的正式合成得到证明,这是一种具有手性苄基季碳中心的萜烯。