Abstract
An efficient and original synthesis of various 2,7-disubstituted pyrido[3,2-d]pyrimidines is reported. The first synthesis of 2,7-dichloropyrido[3,2-d]pyrimidine, by selective palladium-catalyzed dechlorination of 2,4,7-trichloropyrido[3,2-d]pyrimidine at C-4, is described and its chemical reactivity is examined. Diarylated pyrido[3,2-d]pyrimidines were synthesized starting from 2,7-dichloropyrido[3,2-d]pyrimidine by regioselective Suzuki cross-coupling reaction at C-2 and then at C-7.
Key words
pyrido[3,2-
d]pyrimidines - palladium - Suzuki cross-coupling reaction - dechlorination - selectivity