Patent · US Expired

Steroid esters preparation

US4537722A · kind A · utility

4Cited by

2References

19Claims

0Family size

Assignee

AB Leo · SE

Inventors

Anders Robert Stamvik
Sten Krister Kristensson · Helsingborg, SE
Karl-Erik Lundvall · Ängelholm, SE

Key dates

Filing date	May 29, 1984
Grant date	Aug 27, 1985
Priority date	—
Expiry date	May 29, 2004

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07J41/005
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

This invention relates to an improved steroid ester synthesis in which carbodiimides and catalytic amounts of 4-(tertiary amino)-pyridines, in combination with acid catalysts, are used as condensing agents, resulting in pure, non discolored compounds in high yields.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.