New Syntheses of Pyrrolo[3,4-b]indoles, Benzo[b]furo[2,3-c]pyrroles, and Benzo[b]thieno[2,3-c]pyrroles. Utilizing the Reaction of Münchnones (1,3-Oxazolium-5-olates) with Nitroheterocycles

All articles of this category 1,3-Dipolar cycloaddition of münchnones (mesoionic 1,3-oxazolium-5-olates) 3 and 4 with 2- and 3-nitroindoles, 2-nitrobenzo[ b ]furan, and 3-nitrobenzo[ b ]thiophene affords the corresponding pyrrolo[3,4- b ]indoles, benzo[ b ]furo[2,3- c ]pyrroles, and benzo[ b ]thieno[2,3- c ]pyrroles, respectively, in one operation in good to excellent yields. münchnones - nitroheterocycles - 1,3-dipolar cycloaddition - pyrrolo[3,H-b]indoles - fused pyrroles