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:
Sep. 29, 1981
Filed:
Feb. 15, 1980
Osamu Nishikawa, Iwakuni, JP;
Kenji Ishimaru, Iwakuni, JP;
Toru Takeshita, Hino, JP;
Hideki Tsuruta, Iwakuni, JP;
Teijin Limited, Osaka, JP;
Abstract
This invention relates to novel 25-hydroxy-24-oxocholestane derivatives and a process for preparing them. The novel 25-hydroxy-24-oxocholestane derivatives of this invention can easily be converted to 24,25-dihydroxycholecalciferol or 1.alpha.,24,25-trihydroxycholecalciferol which is known as useful for medicine controlling the calcium metabolism of warm-blooded animals. Moreover, 25-hydroxy-24-oxocholestane derivatives can be converted to novel 25-hydroxy-24-oxocholecalciferol expressed by the following formula ##STR1## and novel 1.alpha.,25-dihydroxy-24-oxocholecalciferol of the formula ##STR2## which are useful for medicine. The new 25-hydroxy-24-oxocholestane derivatives in the present invention are very useful as the intermediates for the synthesis of a variety of active vitamin D.sub.3.