Ultrasound-assisted synthesis of substituted guanidines using 1H-pyrazole-1-carboxamidine and S-methylisothiouronium sulfate under solvent-free conditions
作者:Mitsue Fujita、Yoshio Furusho
DOI:10.1016/j.tet.2018.06.057
日期:2018.8
We have investigated ultrasound-assisted synthesis of guanidine derivatives using 1H-Pyrazole-1-carboxamidine (PyzCA) and S-substituted isothiouronium sulfate (MeITU). The guanylations of several amines are promoted by ultrasound sonication under solvent-freeconditions, and proceed under mild conditions. It is of particular interest that the guanylations do not require bases in most cases.