Levoglucosan (8) has been found to be a useful material for the synthesis of chiral compounds having five contiguous chiral centers (14). Conversion of 8 to 14 involves two trans-diaxial openings of epoxides by nucleophilic reagents. Among 14, 14c was successfully transformed into the intermediate 5 for the total synthesis of elaiophylin (1). Efficient lactonization of the carboxylic acid 33 has been achieved by use of Yamaguchi's method.
人们发现左旋
葡聚糖(8)是合成具有五个连续手性中心的手性化合物(14)的有用材料。将 8 转化为 14 涉及到亲核试剂对
环氧化物的两次反式开环。在 14 中,14c 成功地转化为中间体 5,从而实现了依来
菲林的全合成(1)。利用 Yamaguchi 方法实现了
羧酸 33 的高效内酯化。