Method of preparing mono (indolylethylenyl) phthalides
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United States of America Patent
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Jun 8, 1993
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N/A
app pub date -
Nov 6, 1992
filing date -
Jan 3, 1992
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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.
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