Method of preparing mono (indolylethylenyl) phthalides

Details Method of preparing mono (indolylethylenyl) phthalides Method of preparing mono (indolylethylenyl) phthalides

1992-11-06

1993-06-08

Ramsuer, Robert W.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D40514

Patent

active

052181278

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: 4119776 (1978-10-01), Farber

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