Water → 6-bromo-5-(bromomethyl)-1-methyl-3-(3-(tetrahydro-2H-pyran-2-yloxy)propyl) thieno[2,3-d]pyrimidine-2,4(1H,3H)-dione

Participants

Reaction Steps

To a solution of 6-bromo-5-(bromomethyl)-3-(3-hydroxypropyl)-1-methylthieno[2,3-d]pyrimidine-2,4(1H,3H)-dione (2.5 g, 6.1 mmol) and PPTS (153 mg, 0.61 mmol) in DCM (25 mL) at 0° C. was added DHP (2.00 g, 24.5 mmol) dropwise. The reaction was stirred at RT for 18 h, poured into water (30 mL) and extracted with DCM (2×20 mL). The combined organic layers were washed with brine (20 mL), dried over Na2SO4 and concentrated to a residue which was purified by chromatography eluted with PE/EA (4:1) to give 6-bromo-5-(bromomethyl)-1-methyl-3-(3-(tetrahydro-2H-pyran-2-yloxy)propyl)thieno[2,3-d]pyrimidine-2,4(1H,3H)-dione (1.7 g, 56.7% yield) as a yellow oil.

Provenance & Evidence