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Synthesis of 2- and 4-substituted 5,12-dihydroxy-6,11-dioxo-1-azanaphthacenes from 2-aminoquinizarine

✍ Scribed by S. M. S. Chauhan; Mamta Gupta; P. N. H. Nizar


Book ID
112130070
Publisher
Journal of Heterocyclic Chemistry
Year
1991
Tongue
English
Weight
135 KB
Volume
28
Category
Article
ISSN
0022-152X

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Reaction of 1,6-dioxo-2,4-diene with P,Ss and Lawesson's reagent affords the 2,5-disubstituted thiophene. This reaction can take place regioselectively in the presence of BF~-etherate catalysis, useful for the synthesis of arylthiophene.