Drug – bio-affecting and body treating compositions – Antigen – epitope – or other immunospecific immunoeffector – Bacterium or component thereof or substance produced by said...
Patent
1975-06-02
1977-05-10
Roberts, Elbert L.
Drug, bio-affecting and body treating compositions
Antigen, epitope, or other immunospecific immunoeffector
Bacterium or component thereof or substance produced by said...
2603972, 26023955R, A61K 3159
Patent
active
040228916
ABSTRACT:
Novel 1.alpha., 24-dihydroxycholecalciferol and derivatives thereof which are useful with reduced side-effects for the treatment of abnormal metabolism of calcium and phosphorus caused by liver failure, renal failure, gastrointestinal tract failure and parathyroid failure, and related bone diseases. Preparation of the novel 1.alpha., 24-dihydroxycholecalciferol and their derivatives starts from 1.alpha., 24-dihydroxycholesterol prepared by reacting 1.alpha., 2.alpha.-epoxy-24-keto-cholesta-4,6-dien-3-one with an alkali metal and a proton donor in the presence of liquid ammonia or a liquid amine. Reaction of the 1.alpha., 24-dihydroxycholesterol with an allylic brominating agent, followed by contacting with a dehydrobrominating agent, affords 1.alpha.,3.beta., 24-trihydroxycholesta-5,7-diene derivative, which can then be converted to 1.alpha., 24-dihydroxycholocalciferol by ultraviolet irradiation in a organic solvent, followed by isomerization. Processes are also provided for separating 1.alpha., 24-dihydroxycholesterol into an (S)-epimer and an (R)-epimer, and also for separating at least one of 1.alpha., 3.beta., 24(S)-and 1.alpha., 3.beta., 24(R)-trihydroxycholesta-5,7-dienes from trihydroxycholesta-4,6-diene.
REFERENCES:
patent: 3901928 (1975-08-01), Hesse et al.
patent: 3928397 (1975-12-01), Ikekawa et al.
Hashimoto Yoshinobu
Ikekawa Nobuo
Ishimoto Sachio
Kawashima Hiroyuki
Morisaki Masuo
Roberts Elbert L.
Teijin Limited
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