3-(2-Hydroxyphenyl)cyclobutanones react with aryl bromides in the presence of palladium catalysts to afford 4-arylmethyl-3,4-dihydrocoumarins in high yields through a sequence involving carbon-carbon bond cleavage and formation. In the case of the reaction with 2-(2-hydroxyphenyl)cyclobutanones, five- or seven-membered lactones were produced depending on the presence of an additional substituent at
3-(2-羟基苯基)
环丁酮在
钯催化剂的存在下与芳基
溴化物反应,通过涉及碳-碳键裂解和形成的序列,以高收率得到4-芳基甲基-3,4-二氢
香豆素。在与2-(2-羟苯基)
环丁酮反应的情况下,取决于在2-位上是否存在另外的取代基,产生了五元或七元内酯。