2-(1-烷氧基烷基)-4-亚烷基-4 H -3,1-苯并恶嗪可通过1-(2-异氰基苯基)乙炔或1-(2-异氰基苯基)丙-1-酮与环己烯的反应方便地制备。乙烯基量,例如2-甲氧基丙烯或乙基乙烯基醚,在催化量的(±)-樟脑-10-磺酸的存在下。 4 H -3,1-苯并恶嗪-酸催化反应-稠环系统-异氰酸酯-乙烯基醚
4-Alkylidene-2-(dimethylamino)methyl-4H-3,1-benzoxazines could be prepared in one-pot by simply treating alkyl 2-isocyanophenyl ketones with dimethyl(methylene)ammonium iodide (Eschenmoser's salt) in dichloromethane at 0 degrees C without any catalysts.