Silane reduction of 5-hydroxy-6-methyl-pyridine-3,4-dicarboxylic acid diethyl ester: Synthesis of vitamin B6

Article abstract of DOI:10.3390/81200873

Alternative methods for the synthesis of pyridoxine have been investigated. The key intermediate, 5-hydroxy-6-methyl-pyridine-3,4-dicarboxylic acid diethyl ester (5), was reduced with either a silane monomer (MeSiH(OEt)₂) or a polysiloxane (polymethylhydrosiloxane, PMHS) to afford crude pyridoxine. An isolation technique utilizing a commercially available resin was devised, affording the desired product, vitamin B₆, in an overall yield of 38-54% and a purity of 76%.