Abstract
Depending on the reaction conditions, 5-hydroxy- and 5,7-dihydroxypyrido[2,3-d]pyrimidines react with thionyl chloride in the presence of DMF to give chlorination at position 6 along with replacement of the hydroxy groups at C(5) and C(7) with chlorine, while a nitro group at C(6) is ipsosubstituted by chlorine.
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