Reaction of 2-hydroxybenzaldehydes with alkyl vinyl ketones in the presence of 1,4-diazabicyclo[2.2.2]octane proceeds with regioselective cyclisation to afford the corresponding 2H-1-chromenes in yields of up to 87%.
2-羟基
苯甲醛与烷基
乙烯基酮在
乙腈存在下的反应 1,4-二氮杂
双环[2.2.2]辛烷 进行区域选择性 环化可以得到相应的2 H -1-苯甲基,收率可达87%。