N
2-(3,4-dichlorobenzyl)-N
6-methyl-N
4,N
8-di-n-propyl-pyrimido[5,4-d]pyrimidine-2,4,6,8-tetraamine 、 hydrochloric acid diethyl ether 、 6-chloro-N
2-methyl-N
4,N
8-di-n-propylpyrimido[5,4-d]pyrimidine-2,4,8-triamine hydrochloride 在
乙醇 作用下,
以
乙醚 为溶剂,
以to give N2-(3,4-dichloro-benzyl)-N6-methyl-N4,N8-di-n-propyl-pyrimido[5,4-d]pyrimidine-2,4,6,8-tetraamine hydrochloride (51a) (200 mg, 78% y)的产率得到N
2-(3,4-dichlorobenzyl)-N
6-methyl-N
4,N
8-di-n-propyl-pyrimido[5,4-d]pyrimidine-2,4,6,8-tetraamine hydrochloride