Process for preparing 1-substituted pyrrole-3-carboxylic acid de

Details Process for preparing 1-substituted pyrrole-3-carboxylic acid de Process for preparing 1-substituted pyrrole-3-carboxylic acid de

1996-10-31

1997-11-04

Richter, Johann

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D207333

Patent

active

056841612

ABSTRACT:
A simple and industrially viable process for preparing a 1-substituted pyrrole-3-carboxylic acid derivative of formula (I) is provided. The process comprises reacting a compound of formula (II), a compound of formula (III), and an acid anhydride according to the following reaction, ##STR1## wherein R.sub.1 and R.sub.2 individually represent an alkyl, aralkyl, or aryl group.

REFERENCES:
patent: 4560700 (1985-12-01), Sfchnettler et al.
J.Organ.Chem. 1982, 47, 786-791, XP000196816 A.Padwa et al.: "On the Problem of Regioselectivity in the 1,3-Dipolar Cycloaddition Reaction of Munchnones and Sydnones with Acetylenic Dipolarophiles" *p. 787, right-hand column, reaction scheme leading to compounds 15 and 16*.
Heterocycles, vol.27, No. 12, 1988, pp. 2825-2832, XP000196829 P.D. Croce et al.: "Regioselectivity in the 1,3-dipolar cycloaddition reaction of 3-methyloxazolium 5-olates with acetylenic dipolarophiles" *p. 2826, scheme 1*.

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