N,N-Dimethylaniline → 4-Chloro-3-methyl-6-(methylthio)-1H-pyrazolo[3,4-d]pyrimidine

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Reaction Steps

To a mixture of POCl3 (26 mL) and of dimethylaniline (2 mL) was added crude 4-hydroxy-3-methyl-6-methylmercaptopyrazolo[3,4-d]pyrimidine (A-2) (1.46 g, 7.45 mmol). The solution was heated to reflux for 60 min until all solid dissolved. The excess of POCl3 was removed under reduced pressure. The residue was poured into ice water with vigorous stirring, it is stirred for 10 min, and the aqueous solution was extracted with ether. The ether layer was washed with cold water, dried with anhydrous Na2SO4 and concentrated to give the title compound (A-3) (1.21 g, 5.63 mmol). MS-ESI (m/z): 215.0 (M+H)+.

Provenance & Evidence