Asymmetric Synthesis of (+)-Galbelgin, (−)-Kadangustin J, (−)-Cyclogalgravin and (−)-Pycnanthulignenes A and B, Three Structurally Distinct Lignan Classes, Using a Common Chiral Precursor
作者:Claire E. Rye、David Barker
DOI:10.1021/jo200968f
日期:2011.8.19
The enantioselective synthesis of three structurally distinct classes of lignan from a single, aza-Claisen-derived, chiral morpholine amide is reported. The class of lignan formed is dependent on the substitution pattern in the aryl rings and choice of protecting group on a key benzylic hydroxyl group. The methodology has been used to asymmetrically synthesize and determine the absolute stereochemistry
据报道,从单一的,氮杂-克莱森衍生的手性吗啉酰胺中,对映体选择性合成了三种结构不同的木脂素。形成的木脂素的种类取决于芳基环中的取代方式和关键苄基羟基上保护基的选择。该方法已用于不对称合成和确定木脂素(+)-环没食子碱3,(-)-吡喃蒽烯A 4,(-)-吡喃蒽烯B 5和(-)-kadangustin J 8的绝对立体化学。