Journal of Heterocyclic Chemistry p. 87 - 91 (1997)
Update date:2022-08-18
Topics:
Cho, Hidetsura
Matsuki, Shinsuke
Mizuno, Akira
Annoura, Hirokazu
Tatsuoka, Toshio
A highly convenient method for the synthesis of 2-substituted pyrrole derivatives 7a-c from pyrrole using phosgene was developed. Successively, 7-methyl-6,7-dihydro-1H,5H-pyrrolo[2,3-c]azepine-4,8-dione 1a and 6,7-dihydro-1H,5H-pyrrolo[2,3-c]azepine-4,8-dione 1b (aldisin) were synthesized by phosphorus pentoxide/methanesulfonate and polyphosphoric acid cyclization.
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