3-methyl-1-oxo-1-H-2-benzopyran-4-carboxylic acid was synthesized in excellent yields by the reaction of homophthalic anhydride with acetyl chloride using pyridine as a catalyst, followed by rearrangement of 4-acetyl- 1H-2-benzopyran-1,3(4H)-dione with Conc. Sulphuric acid. Further 3-methyl-1-oxo-1H-2-benzopyran-4-carboxylic acid was derrivatised to various isoquinolones using ammonia and respective primary amines. It was also inferred the isoquinolones obtained were same when ammonia and other primary amines were treated with 3-methyl-1-oxo- 1-H-2-benzopyran-4-carboxylic acid, 4-acetyl-1H-2-benzopyran-1,3(4H)-dione, or 3-methyl-1H-2-benzopyran-1- one.
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