penicisochroman A 在
camphor-10-sulfonic acid 作用下,
以
甲苯 为溶剂,
反应 0.25h,
以100%的产率得到ustusorane B
参考文献:
名称:
Synthesis and Structural Characterization of Natural Benzofuranoids
摘要:
The synthesis of ustusoranes A, B, and E, pergillin, dihydropergillin, (+/-)-penicisochroman A, and (-)-brassicadiol, starting from optically active (R)-benzolactone, is described. The synthesis of ustusoranes A and E established the absolute configurations of these natural products. The synthesis of pergillin and ()-penicisochroman A led to the structural revision of aspergiones E and F. This study clearly indicates that (R)-benzolactone is a potential intermediate in the synthesis of natural benzofuranoids.