Process for preparing benzopyran derivatives

US3962280A · kind A · utility

Assignee

• SCHERING CORPORATION · US

Inventors

• Ulrich Eder · Berlin, DE
• Gerhard Sauer · Berlin, DE
• Gregor Haffer · Berlin, DE
• Jurgen Ruppert
• Rudolf Wiechert · Berlin, DE

Key dates

• Filing date: Jun 6, 1973
• Grant date: Jun 8, 1976
• Expiry date: Jun 6, 1993

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D311/94
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Novel benzopyran derivatives of the formula ##SPC1## Wherein R.sub.1 and R.sub.3 each are lower alkyl; n is the integer 1 or 2; --A--B-- is >CH--CH.sub.2 -- or >CH=CH--; X is a free, esterified or etherified hydroxy group; and Y is H or X and Y collectively are =O; and W is --(CH.sub.2).sub.3 --Z--R.sub.4, --(ch.sub.2).sub.3 --coor.sub.6 or --(CH.sub.2).sub.3 CN, wherein V is halogen, Z is a ketalized carbonyl group R.sub.4 and R.sub.5 each are lower alkyl and R.sub.6 is alkyl, aryl or aralkyl, are valuable intermediates in the synthesis of steroids.