A new tris-annulation reagent prepared from a butadiene telomer, and its application to steroid synthesis
作者:Jiro Tsuji、Yuichi Kobayashi、Takashi Takahashi
DOI:10.1016/s0040-4039(00)71439-0
日期:1980.1
Reaction of 1,7-octadien-3-one with dimethyl malonate, followed by the reduction of the ketone produced dimethyl (3-hydroxy-7-octenyl)malonate, which was converted to 9-decen-5-olide after hydrolysis and decarboxylation. Reaction of vinylmagnesium chloride with the lactone and the subsequent acylation afforded 7-acetoxy-1,11-dodecadien-3-one. This is a new tris-annulation reagent. (±)-D-homo-19-no
1,7-辛二烯-3-酮与丙二酸二甲酯反应,然后还原酮生成(3-羟基-7-辛烯基)丙二酸二甲酯,水解和脱羧后将其转化为9-癸烯-5-油酸酯。乙烯基氯化镁与内酯的反应和随后的酰化得到7-乙酰氧基-1,11-dodecadien-3-one。这是一种新型的tris-annulation试剂。使用该tris-环化试剂合成了(±)-D-homo-19-norandrosta-4-en-3-one。