Stereocontrolled total syntheses of (±)-pisiferic acid and (±)-O-methylpisiferic acid
作者:Subrata Kumar Pal、Pranab Dutta Gupta、Debabrata Mukherjee
DOI:10.1016/s0040-4020(02)00062-5
日期:2002.2
trans-octahydrophenanthrene ring system related to diterpenes involving an aryl participated diazoketone cyclisation strategy is delineated. The tetrahydrophenanthrenone 7 was prepared from the tetralone 6 through the intermediates 13, 14, 16 and 17. The formyl derivative of 7 was treated with alkaline H2O2 to give the diacid 18 which was converted into the diazomethyl ketone 9. Aryl participated cyclisation
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。