Neighboring effect by heteroaromatic rings: formation of skeletally rearranged adducts by cycloaddition reaction of norbornadiene-fused pyridazines and pyrazines with 4-phenyl-1,2,4-triazole-3,5(4H)-dione
作者:Tomoshige Kobayashi、Kiyomi Miki、Behrooz Nikaeen、Hideaki Baba
DOI:10.1016/s0040-4020(99)00821-2
日期:1999.11
Norbornadiene-fused pyridazines and pyrazines reacted with 4-phenyl-1, 2,4-triazole-3,5(4H)-dione to give skeletally rearranged adducts in moderate yields. A similar reaction with fused pyridazine N-oxides or a fused pyrazine N-oxide resulted in the regioselective formation of the rearranged adduct. The formations of the skeletally rearranged adducts would be ascribed to the intervention of bridged