2氯甲基化法 CH HCHO+ HCl DKCH3CO2H, H3PO4 H2O 56% 3由重氮盐制备 N2 BFA NaNO,, HCI HBFA CH K2.氯甲基化法 3.由重氮盐制备 + HCHO + HCl 冰CH3CO2H，H3PO4 56% CH2Cl + H2O NH2 CH3 NH2 CH3 NaNO2，HCl HBF4 NaNO2，HCl HBF4 N2 + BF4 - CH3 F CH3