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:
Nov. 03, 1981
Filed:
Nov. 28, 1979
Osamu Nishikawa, Iwakuni, JP;
Kenji Ishimaru, Iwakuni, JP;
Toru Takeshita, Hino, JP;
Hideki Tsuruta, Iwakuni, JP;
Teijin Limited, Osaka, JP;
Abstract
A process for producing a steroid compound having an oxo group in the side chain, which comprises condensing an acid halide having a steroid skeleton with an organozinc compound at the halocarbonyl group of the acid halide in an inert organic medium in the presence of a catalytic amount of an ether capable of forming a complex with the organozinc compound, and if desired, hydrolyzing the product. The process produces the steroid compound at a high yield, and often at an almost quantitative yield. The steroid compound is an important intermediate for the production of vitamin D.sub.3 analogs such as active forms of vitamin D.sub.3. In one preferred embodiment, an industrially advantageous process from the standpoint of operation is provided.