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Title: Synthesis of 3-methyl-4-[(chromon-3-yl) methylene]-1-phenylpyrazolin-5(4H)-ones and their conversion into 2-thio-5-hydroxy-5H[1]-benzopyrano[4,3-d] pyrimidines
Authors: Karale, B K
Gill, C H
Khan, Mohib
Chavan, V P
Mane, A S
Shingare, M S
Issue Date: Sep-2002
Publisher: NISCAIR-CSIR, India
Abstract: Reaction of 4-oxo-4H-[1]-benzopyran-3-carboxaldehydes with 3-methyl-1-phenylpyrazolin-5(4H)-one in dioxane in the presence of triethylamine affords 3-methyl-4- [(chromon-3-yl)methylene]-phenylpyrazolin-5(4H)-ones 3a-k. Condensation of 3 with thiourea in alcoholic KOH under reflux yields 2-thio-5-hydroxy-5H[1]-benzopyrano[4,3-d]pyrimidines 6a-h.
Page(s): 1957-1959
ISSN: 0975-0983(Online); 0376-4699(Print)
Appears in Collections:IJC-B Vol.41B(09) [September 2002]

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