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Paper | Regular issue | Vol 43, No. 1, 1996, pp.127-131
Published online, 1st January, 1970
DOI: 10.3987/COM-95-7238
Ring Construction of Several Heterocycles with Phosphorus Pentoxide-Methanesulfonic Acid (PPMA)

Hidetsura Cho* and Shinsuke Matsuki

*Japan Tobacco Inc., Central Pharmaceutical Research Institute, 1-1, Murasaki-cho, Takatsuki, Osaka, 569, Japan

Abstract

The cyclization reactions with CH3SO3H/P2O2 (PPMA) or CF3SO3H/P2O5 (PPTMA) at 80-100 °C for 3-10 min afforded several heterocycles (6,7-dihydropyrrolo[2,3-c]azepin-4,8-(1H,5H)-dione, 4-oxo-4,5,6,7-tetrahydrothianaphthene, carbostyril derivatives).