作者:B.R. Davis、W.B. Watkins
DOI:10.1016/0040-4020(68)88118-9
日期:1968.1
The conversion of the diterpenoid resin acid, podocarpic acid, into a tetracyclic system possessing a 5-membered ring D is described. The unsubstituted ring with a CO group at C-151 was prepared from the 13-(2′-carboxyethyl) derivative III (R CH2CH2CO2H) in fair yield, but attempted cyclization of compounds possessing a 1′-substituted-2′-carboxyethyl side chain at C-13 was unsuccessful. The C-17
描述了将二萜树脂酸,罗汉果酸转化为具有5元环D的四环体系。由13-(2'-羧乙基)衍生物III(RCH 2 CH 2 CO 2 H)以合理的产率制备了在C-15 1处带有CO基团的未取代环,但尝试将具有1'的化合物环化C-13的-取代的2'-羧乙基侧链不成功。从13-丙烯酰基化合物以低收率获得C-17酮,但从13-巴豆酰基化合物根本得不到。描述了一些涉及苯甲醚衍生物的模型实验。