Water → 6-Chloro-2-[1-(3-isoquinolyl)ethylsulfanyl]pyrimidin-4-amine

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Reaction Steps

4-Amino-6-chloro-2-mercapto-pyrimidine mesylate salt (1.79 g, 6.94 mmole) is dissolved in 12 ml dry dimethylformamide in a 50 ml one neck round bottom flask under nitrogen. The solution is treated with 60% sodium hydride (605 mg, 15.1 mmole) (exotherm) and the mixture is stirred one hour. 3-(1-chloroethyl)-isoquinoline (1.33 g, 6.94 mmole) in 2×3 ml dry dimethylformamide, is added to the reaction and the mixture is stirred 6 hours at room temperature. The reaction mixture is poured into 300 ml water and is extracted with 3×100 ml ethyl acetate. The combined organics are backwashed with 4×50 ml 50% saturated sodium chloride. The organics are dried over potassium carbonate and are concentrated in vacuo to a yellow oil. The crude material is chromatographed over 75 g silica gel (230-400 mesh), eluting with 40% acetone/hexane while collecting 9 ml fractions. Fractions 26-39 are combined and concentrated to afford 1.26 g (57%) of 4-Amino-6-chloro-2-(1-(3-isoquinolyl)ethyl)thio-pyrimidine as a white solid.

Provenance & Evidence