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Paper | Regular issue | Vol 24, No. 12, 1986, pp.3397-3401
Published online, 1st January, 1970
DOI: 10.3987/R-1986-12-3397
Reactions with Chlorosulfonyl/Chlorocarbonyl Isocyanates: Synthesis of Pyrrolo[1,2,3-de]-1,2,4-benzothiadiazin-3(2H)-one 1,1-Dioxides and 1H-Pyrrolo[3,2,1-ij]quinazoline-1,3(2H)-diones

Ahmed Kamal,* Narender A. V. Reddy, and Prahlad B. Sattur

*Regional Research Laboratory, Hyderabad 500 007, India


6-Substituted 2,3-diphenylindoles on reaction with chlorosulfonyl/chlorocarbonyl isocyanates, followed by cyclization with aluminium chloride afforded 9-substituted 5,6-diphenylpyrrolo[1,2,3-de]-1,2,4-benzothiadiazin-3(2H)-one, 1,1-dioxides 2 and 9-substituted 5,6-diphenyl-1H-pyrrolo[3,2,1-ij]quinazoline-1,3(2H)-diones 3 respectively. In these reactions, an electron donating substituent such as methyl group at position 6 in indole is necessary for cyclization.