Abstract
ABSTRACTAn effective and novel photochemical method for the preparation of 2,4-disubstituted pyrido[2,3-d]pyrimidines is reported from 2,4-dimethylsulfanyl-pyrido[2,3-d]pyrimidines through a Liebeskind-Sroglcoupling reaction involving an original selective methyl sulfanyl discrimination using UV light as a source of energy. Our strategies involve a two-step and a one-pot approach with reaction times of 11-18 h and yields ranging between 72 and 94%. The two strategies are compared.
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