The Michael addition of methylvinylketone to β-dicarbonyl compounds prepared from d, l-Δ8a-1-oxo-4β-hydroxy-4bβ-methyl-7-ethyl-enedioxy-4aα, 10aβ-dodecahydro-phenanthrene (Ia) and from the corresponding 1,4-diketone I c has been investigated. Thus from the 2-alkoxyoxalyl compounds III, IVa and b the 2α-alkoxyoxalyl-2 β- (γ-oxo-butyl) derivatives Va, Vb and VIa were obtained in excellent yield.
该迈克尔加成到甲基
乙烯基酮β二羰基化合物,从d,1-Δ制备8A -1-氧代4β羟基4bβ甲基-7-乙基enedioxy-4aα,10aβ十二氢
菲(Ia)和从所述已经研究了相应的1,4-二酮I c。因此,从2-烷氧基草酰化合物III,IVa和b以优异的产率获得了2α-烷氧基草酰-2β-(γ-氧代丁基)衍
生物Va,Vb和VIa。