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Conversion of (±)-3-ethyl-3-methyl phthalides to 3,3-dimethyl-3,4-dihydroisocoumarins. Synthesis of 3-methylmellein

✍ Scribed by B. H. Bhide; A. J. Kalaria; B. M. Panchal

Publisher
Journal of Heterocyclic Chemistry
Year
2002
Tongue
English
Weight
29 KB
Volume
39
Category
Article
ISSN
0022-152X

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✦ Synopsis

Abstract

o‐Lithio yV‐methyl benzamides (1a‐f) upon alkylation with ethyl methyl ketone gave (±)‐3‐ethyl‐3‐methyl phthalides (2a‐f), which upon treatment with concentrated H~2~SO~4~ or anhydrous A1C1~3~ furnished corresponding 3,3‐dimethyl‐3,4‐dihydroisocoumarins (3a‐f) and 3‐methyl mellein (3g).

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