Hydrochloric Acid → (6-(4,4-Dimethylcyclohexyl)-2-methylthieno[2,3-d]pyrimidin-4-yl)methanol

Participants

Reaction Steps

To a mixture of ethyl 6-(4,4-dimethylcyclohexyl)-2-methylthieno[2,3-d]pyrimidine-4-carboxylate (13.0 g), THF (150 mL), and EtOH (150 mL) was added calcium chloride (6.6 g), followed by stirring at room temperature for 30 minutes and then adding NaBH4 (1.8 g) in small divided portions over 15 minutes under ice-cooling. After stirring at room temperature for 4.5 hours, to the reaction mixture were added water (100 mL) and EtOAc (100 mL) under ice-cooling. 1 M Hydrochloric acid (100 mL) was added thereto until the suspension became a solution, followed by concentration under reduced pressure and extracting with EtOAc. The organic layer was washed sequentially with water, saturated aqueous sodium bicarbonate, and brine, dried over MgSO4, and then concentrated under reduced pressure. The residue was purified by silica gel column (chloroform/EtOAc) to obtain [6-(4,4-dimethylcyclohexyl)-2-methylthieno[2,3-d]pyrimidin-4-yl]methanol (9.35 g).

Provenance & Evidence