Unlike other electron-deficient pyridazines, the title compound 1 is found to represent a valuable synthon for hetero Diels–Alder reactions with different unactivated dienophiles.
Study on direct benzoannelations of pyrrole and indole systems by domino reactions with 4,5-dicyanopyridazine
作者:Donatella Giomi、Marco Cecchi
DOI:10.1016/s0040-4020(02)00958-4
日期:2002.9
The title pyridazine 1 was found to undergo hetero Diels–Alder [4+2] cycloadditions on the C(2)–C(3) double bond of pyrrole and indole systems; spontaneous loss of nitrogen from the primary adducts, followed by oxidation processes, afforded the corresponding fully aromatic benzoannelated skeletons in modest and reasonable yields, respectively. Competitive attacks of the same systems at the strongly