New bis- and tris-annulation reagents for the syntheses of CD rings of steroids, bearing a functionalized 18-methyl group, by the palladium-catalyzed cyclization
作者:Jiro Tsuji、Yuichi Kobayashi、Hideaki Kataoka、Takashi Takahashi
DOI:10.1016/s0040-4039(00)78697-7
日期:1980.1
2-alkoxycarbonyl-3-vinylcyclopentanones (2), easily prepared by the palladium-catalyzed cyclization of 2-substituted 3-oxo-8-phenoxy-6-octenoates (1), are very suitable building blocks for CD rings of steroids, bearing particularly a functionalized 18-methyl group.
2-取代的2-烷氧基羰基-3-乙烯基环戊酮(2)很容易通过钯催化的2-取代的3-氧代-8-苯氧基-6-辛烯酸酯(1)的环化反应制备,是非常适合的CD环的结构单元。类固醇,特别带有官能化的18-甲基。