Kl. Perlman et al., SYNTHESIS OF NOVEL 20-OXO-PREGNACALCIFEROL ANALOGS WITH BINDING-AFFINITY TO THE PROGESTERONE-RECEPTOR, Bioorganic & medicinal chemistry letters, 5(22), 1995, pp. 2695-2700
3-Desoxy-20-oxo-19-nor-pregnacaliferol (6a) and its 2-oxo analog 6c we
re prepared from 22-acetoxy-Grundmann's ketone 1 and the corresponding
(cyclohexylidene)ethyl phosphine oxides 2a, b and their binding to th
e progesterone receptor examined.