Mono(indolylethylenyl)phthalides

Details Mono(indolylethylenyl)phthalides Mono(indolylethylenyl)phthalides

1992-01-03

1993-04-06

Ramsuer, Robert W.

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

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

544143, 546165, 546 94, 548427, 548456, C07D40506, C07D40514, C07D41314

Patent

active

052005194

ABSTRACT:
Preparation of novel mono(indolylethylenyl) phthalides is disclosed. Specifically, these compounds are chromogenic mono(indolylethylenyl)phthalides of the formula ##STR1## wherein A is as hereinafter defined and selected from moieties of the type ##STR2## wherein L is an indole moiety as hereinafter defined; wherein B is a moiety of the type ##STR3## as hereinafter defined. The process disclosed comprises condensing indolylethylene with a keto acid or its derivative and an electron acceptor in an organic solvent.

REFERENCES:
patent: 4970308 (1990-11-01), Mathiaparanam

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