N,N-Dimethylaniline → 4-Chloro-2-(pyridin-3-yl)-6-methylthieno[2,3-d]pyrimidine

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Reaction Steps

The replacement of the keto group by Cl under the formation of the aromatic pyrimidine ring takes place under standard conditions. A mixture of POCl3 (18 ml) with 3,4-dihydro-4-oxo-2-(pyridin-3-yl)-6-methyl-thieno-[2,3-d]-pyrimidine (6 g) is refluxed for 4 hours under the addition of N,N-dimethylaniline (1,8 m). The usual workup yields 4-chloro-2-(pyridin-3-yl)-6-methyl-thieno-[2,3-d]-pyrimidine (5 g)

Provenance & Evidence