It is illustrated as formula R1 (R2)-N-CO-Y, the symbol meanings are described in the description. According to the present method, the compounds having NH-group are reacted with alfa-halogenated derivatives in the presence of hydrogen halide acid acceptor at temp. of -5 to 150 deg.C. The resultant carbamic acid ester, sulphocarbamic acid ester or urea are very useful compounds, especially used as a pesticide.