1-.alpha.-hydroxy vitamin D compounds and process for preparing same
申请人:——
公开号:US04670190A1
公开(公告)日:1987-06-02
The invention provides novel 1.alpha.-hydroxy vitamin D compounds and a method for their preparation from 1.alpha.-hydroxy-25-hydrogen cholesta-5,7-dienes by irradiation and isomerization techniques. The invention also includes the said 1.alpha.-hydroxy-25-hydrogen-cholesta-5,7-dienes and the corresponding cholest-5-enes. The new compounds may be obtained in a crystalline form substantially free from isomeric or other impurities arising from manufacture.
1α-Hydroxyvitamin D3 (20) was prepared from cholesterol (1) in ca. 1% overall yield. Hydroboration of the tetrahydropyranyl ether 2 followed by chromic acid oxidation and NaBH4 reduction gave the 6β-ol 5. Brief treatment of its acetate 6 with acid followed by Jones oxidation gave the 6β-acetoxy-3-one (7) in 55% yield from 1. Introduction of C-1 double bond (64%) was effected by bromination of 7, followed by dehydrobromination with CaCO3, yielding the 3-oxo-1-ene 9. Oxidation of 9 with alkaline H2O2 afforded the 1α, 2α-epoxide 10 (80%) and this was converted by successive 6 steps sequences to 1α-hydroxycholesterol 15 in 43% yield. The 5, 7-diene 19 was obtained from the acetate 16 in 40% yield by allylic bromination with N-bromosuccinimide, dehydrobromination with trimethyl phosphite and saponification. Ultraviolet irradiation of 19 in benzene solution followed by thermal isomerization, produced 1α-hydroxyvitamin D3 (20) (20%).
Certain compounds, structurally related to natural compounds which can be extracted i.a. from bull testes and from human follicular fluid, can be used for regulating the meiosis in oocytes and in male germ cells. Some of these compounds are useful in the treatment of infertility, whereas other compounds are useful as contraceptives. These compounds have the structural formula
1
wherein the substituents are as defined in the specification.
Ausgehend von Cholesten-(1)-on-(3) (IV) wurden 1-Keto-cholestan (XX), 1 α-Oxy-cholestan (XVIII) und 1 β-Oxy-cholestan (XXI) auf eindeutigem Wege in Kristallen bereitet.
Ausgehend von Cholesten-(1)-on-(3)(IV)wrist克里斯塔伦(Kristallen)的1-酮胆甾醇(XX),1α-羟基胆甾烷(XVIII)和1β-羟基胆甾烷(XXI)贝雷特。