Synthesis method of thermosensitive sensitizer N-p-tolylsulfonyl-N'-(3-p-tolylsulfonyl oxyphenyl) urea

The invention provides a synthesis method of a thermosensitive sensitizer N-p-tolylsulfonyl-N'-(3-p-tolylsulfonyl oxyphenyl) urea. The m-aminophenol and the p-toluenesulfonyl isocyanate firstly react to generate N-[(3-hydroxy phenyl) formamyl]-4-toluenesulfonamide, the paratoluensulfonyl chloride is directly reacted with the above mixture without processing the reaction so as to obtain the N-p-tolylsulfonyl-N'-(3-p-tolylsulfonyl oxyphenyl) urea, and the product yield is up to more than 98%.