Regioselective synthesis of polysubstituted 3,3′-bi-1H-pyrazole derivatives via 1,3-dipolar cycloaddition reactions
作者:Ahmad M. Farag、Nabila A. Kheder、Milos Budesinsky
DOI:10.1016/s0040-4020(97)00583-8
日期:1997.7
add regioselectively to α-(benzothiazol-2-yl)cinnamonitriles 3 and α-(1-methylbenzimidazol-2-yl)cinnamonitriles 7 to yield exclusively the cycloadducts 5,5′-dicyano-4,4′,5,5′-tetrahydro[3,3′-bi-1H-pyrazoles] 4 and 8, respectively. Compounds 4 and 8 undergo aromatization via thermal elimination of hydrogen cyanide under basic conditions to afford the corresponding 3,3′-bi-1H-pyrazole derivatives 6 and