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.
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Wettstein et al. (1957) studied this question.
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