The C-formylation of 1,3-dimethyl-2(3H)-benzimidazolone and 4-methyl-2H-1,4-benzoxazin-3(4H)-one was performed using 1,1-dichloromethyl methyl ether at the Friedel-Crafts reaction conditions. The formylation of 3-methyl-2(3H)-benzoxa- and -thiazolone at the 6-position was carried out by modified Duff's method with hexamethylenetetramine in trifluoroacetic acid.
对1,3-二甲基-2(3H)-苯并咪唑酮和4-甲基-2H-1,4-苯并噁嗪-3(4H)-酮进行C-甲酰化反应,使用1,1-二氯甲基甲醚在Friedel-Crafts反应条件下进行。对3-甲基-2(3H)-苯并噁唑酮和噻唑酮在6位进行甲酰化反应,采用改良的Duff方法,使用六亚甲基四胺在三氟乙酸中进行。