The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 22, 1980
Filed:
Sep. 01, 1978
Toru Takeshita, Hino, JP;
Takao Niki, Hino, JP;
Hiroyuki Kawashima, Hino, JP;
Kiyoshi Bannai, Hino, JP;
Teijin Limited, Osaka, JP;
Abstract
Novel 1.alpha.,3.beta.-dihydroxy-24-oxocholesta-5,7-diene and the hydroxyl group-protected derivatives thereof. Said novel 1.alpha.-hydroxy-24-oxovitamin D.sub.3 and said novel intermediates are also useful as the intermediates of 1.alpha.,24-dihydroxyvitamin D.sub.3. 1.alpha.,3.beta.-Dihydroxy-24-oxocholesta-5,7-diene and the hydroxyl group-protected derivatives thereof are prepared from fucosterol via 1.alpha.,3.beta.-diprotected hydroxy-24(24)-ethylenedioxycholest-5-ene. 1.alpha.-hydroxy-24-oxovitamin D.sub.3 is prepared by irradiation with ultraviolet rays to 1.alpha.,3.beta.-dihydroxy-24-oxocholesta-5,7-diene or a hydroxyl group-protected derivatives thereof, isomerization using heat energy, and, when necessary, elimination of the protecting groups.