、
diethyl phosphite 、
4-hydroxy-1,3,5,5-tetramethyl-tetrahydro-pyrimidin-2-one 以to form 2-oxo-1,3,5,5-tetra methyl-hexahydro-4-pyrimidyl-phosphonic acid diethylester的产率得到(1,3,5,5-tetramethyl-2-oxo-hexahydro-pyrimidin-4-yl)-phosphonic acid diethyl ester