Patent · US Expired

Process for the preparation of pyrrole derivates

US5290947A · kind A · utility

8Cited by

5References

8Claims

0Family size

Assignee

Cassella Aktiengesellschaft · DE

Inventors

Gerhard Zoller · Blankenloch, DE
Eckard Kujath · Maintal, DE
Klaus Delpy · Dietzenbach, DE
Manfred Schrod · Weiterstadt, DE

Key dates

Filing date	Mar 16, 1993
Grant date	Mar 1, 1994
Priority date	—
Expiry date	Mar 16, 2013

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D207/333
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The present invention relates to a process for the preparation of pyrrole derivatives of the general formula I ##STR1## by reaction of a compound of the general formula III ##STR2## where R, R.sup.1 and R.sup.2 are defined as specified in claim 1, in a Vilsmeier reaction. The reaction is carried out in an easily degradable solvent, the reaction product is isolated with the aid of a water-miscible extractant and is purified by high-vacuum distillation in the short path evaporator.

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