Potassium Phosphate, Tribasic → 8-(2-cyclopropylbenzyl)-2-(methylthio)pyrido[2,3-d]pyrimidin-7(8H)-one

Participants

Reaction Conditions

Reaction Steps

8-(2-bromobenzyl)-2-(methylthio)pyrido[2,3-d]pyrimidin-7(8H)-one (150 mg, 0.41 mmol, Example 30), cyclopropylboronic acid (107 mg, 1.25 mmol), K3PO4 (264 mg, 1.24 mmol) and PdCl2(Pcy3)2 (15 mg, 0.02 mmol) were mixed as solids and placed under argon. Argon was bubbled through a mixture of toluene:water (20:1, 1.5 mL) for 20 min. The solvent was added to the solid and the suspension was heated under microwave irradiation at 140° C. for 1.5 h. The reaction mixture was then diluted with toluene (10 mL) and water (1×5 mL), the two phases were separated, and the aqueous layer was extracted with toluene (1×10 mL). The combined organic layers were washed with water (1×10 mL) and evaporated to dryness. The crude compound was purified by silica gel column chromatography using dichloromethane:methanol (100:0.5) to yield 8-(2-cyclopropylbenzyl)-2-(methylthio)pyrido[2,3-d]pyrimidin-7(8H)-one as an off-white solid (88 mg, 0.27 mmol, 66%). ESMS m/z 324 (M+H)+.

Provenance & Evidence