Synthese von 1α-Hydroxycholecalciferol. Vorläufige Mitteilung
摘要:
Abstract1α‐hydroxycholesterol (4a) was synthesized from cholesterol and transformed via its diacetyl derivative 4b into 1α, 3β‐diacetoxycholesta‐5, 7‐diene (6b). Irradiation of the ring‐B‐diene 6b followed by thermal isomerization and saponification gave 1α‐hydroxycholecalciferol (7).
1α,2β-Dihydroxycholesterol has been prepared from 1α,2β-epoxy-5α-cholestan-3β,6β-diol-3-acetate on reaction with methansulphonyl chloride and hydrochloric acid. The structure was confirmed by independent synthesis from 1α,2β-epoxycholest-5-en-3β-yl acetate.