Synthesis and biological evaluation of a new series of dihydrofolate reductase inhibitors based on the 4-(2,6-diamino-5-pyrimidinyl)alkyl-L-glutamic acid structure

A novel series of dihydrofolate reductase inhibitors was uncovered during an expansion of the SAR of 5,10-dideazatetrahydrofolic acid, and their biological activity was evaluated. These new analogs do not possess an oxygen at the 4 position and contain a monocyclic pyrimidine ring.