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Summary 6β-N(5)-methyl-5.6J,8-tetrahydro-L-biopterin·2 HC1. a new derivate of biological interest, was synthesized from 6β-5,6,7,8-tetrahydro-L-biopteril·2 HC1 and characterized. The latter compound has been used therapeutically in atypical phenylketonuria for many years. The catalytic reductive methylation with PtO 2  /H 2  and formaldehyde allowed selective methylation at the N(5) position. The chemical properties and stnlctures of the new compound arc compared with N(5)-methyl-tetrahydropterin and N(5)-methyl-tetrahydrofolate.

Synthesis of 6β-N(5)-Methyl-5,6,7,8-tetrahydro-L-biopterin