描述了一种立体控制的方法来构造与涉及芳基参与的二氮酮环化策略的二萜有关的有角酯取代的反式-八氢菲菲环系统。所述tetrahydrophenanthrenone 7从四氢萘酮制备6通过中间体13,14,16和17。用碱性H 2 O 2处理7的甲酰基衍生物,得到二酸18,将其转化为重氮甲基酮9。Aryl参加了9的环化得到二烯酮10,其被立体选择性地转化为酮酯11。已经有效地完成了11到二萜1和4的转化。
Facile transformation of 1-methoxynaphthalenes to octahydrophenanthrenes application to the total synthesis of (±)-sempervirol methyl ether, (±)-sugiol methyl ether, (±)-nimbiol methyl ether, and (±)-nimbidiol dimethyl ether
general method has been developed for the synthesis of the tricyclic aromatic ketones 4,12,13 and 14 from the 1-methoxynaphthalenes 8,9,10 and 11 respectively. The transformations of the ketones 4,12,13 and 14 into the diterpene ethers (±)-sempervirol methylether (7), (±)-sugiol methylether (15), (±)-nimbiol methylether (16), and (±)-nimbidiol dimethyl ether (17) have been successfully accomplished