This article describes an efficient method for the preparation of chiral chroman derivatives by the Pd(II)-catalyzed asymmetric Wacker-type cyclization using a chelation-induced axially chiral tetraoxazoline ligand. Under the optimized conditions, up to 80% yield and up to 92% ee were obtained. This is the first example to utilize o-trisubstituted 3-butenylphenols as substrates in such transformation
本文介绍了一种有效的方法,通过使用螯合诱导的轴向手性四
恶唑啉
配体,通过Pd(II)催化的不对称Wacker型环化制备手性苯并二氢
吡喃衍
生物。在优化的条件下,可获得高达80%的收率和高达92%的ee。这是在这种转化中利用邻三取代的3-
丁烯基
酚作为底物的第一个例子。