3-dienyl)-3-methylpyrazines (5) and 3-(buta-1,3-dienyl)-4-methyl-1,2,5-oxadiazoles (10) were synthesized starting from base-induced reaction of 2,3-dimethylpyrazine or 3,4-dimethyl-1,2,5-oxadiazole with α,β-unsaturated carbonyls. The thus obtained heteroaromatics bearing a butadienyl moiety and a methyl at the adjacent position underwent intramolecular cyclization by the action of LDA to give the corresponding
从碱开始合成2-(Buta-1,3-二烯基)-3-甲基
吡嗪(5)和3-(buta-1,3-二烯基)-4-甲基-1,2,5-恶二唑(10)诱导的2,3-二甲基
吡嗪或3,4-二甲基-1,2,5-恶二唑与α,β-不饱和羰基的反应。如此获得的在相邻位置带有
丁二烯基部分和甲基的杂芳族化合物通过
LDA的作用进行分子内环化,得到相应的杂芳族化合物,该杂芳族化合物与七元环[ 7(8)]和[ 11(12)]稠合。高产。