The reaction of o-(allyloxy)bromobenzenes with copper(I) diethyl malonate afforded diethyl o-(allyloxy)phenylmalonates which under the reaction conditions cyclized to give 4,4-bis(ethoxycarbonyl)-3-methylchromans, 4,4-bis(ethoxycarbonyl)-3-methylenechromans, and 3-(3-butenyl)-4,4-bis(ethoxycarbonyl)chromans.
邻(烯丙氧基)
溴苯与
丙二酸二乙酯铜(I)反应得到邻(烯丙氧基)
苯基丙二酸二乙酯,其在反应条件下环化得到4,4-双(乙氧基羰基)-3-甲基苯并二氢
吡喃,4,4-双(乙氧基羰基)-3-亚甲基苯并二氢
吡喃和3-(3-
丁烯基)-4,4-双(乙氧基羰基)苯并二氢
吡喃。