A novel synthetic protocol for the heteroannulation of oxocarbazole and oxoazacarbazole derivatives through corresponding oxoketene dithioacetals

Article abstract of DOI:10.1002/jhet.1523

An efficient novel strategy for the heteroannulation of 6,7-dihydropyrazolo[3,4-b]carbazol-8(1H,5H,9H)-one 4 and 5-N-benzyl-6,7- dihydropyrazolo[3,4-b]carbazol-8(1H,9H)-one 5 has been developed to allow the incorporation of pyrazole, isoxazole, pyrimidine, benzodiazepine, and benzothiazepine rings through their corresponding oxoketene dithioacetal derivatives 6 and 7, respectively.