Cesium carbonate → HCID 86665191, compound

Participants

Reaction Steps

To a solution of tert-butyl 5,6-bis(chloromethyl)pyridine-3-carboxylate (1.80 g, 6.52 mmol) in N,N-dimethylformamide (93.0 mL) was added 4-chloro-5,7-dihydro-6H-pyrrolo[2,3-d]pyrimidin-6-one (1.80 g, 10.62 mmol), cesium carbonate (3.65 g, 11.21 mmol), and sodium bromide (0.671 g, 6.52 mmol). After 30 min, saturated aqueous sodium bicarbonate was added and the mixture was washed with ethyl acetate (3×). The combined organics were washed with water (3×), brine (3×) and were dried with magnesium sulfate, filtered and concentrated. Purification by silica gel chromatography (100% dichloromethane→10% methanol/dichloromethane) then a second purification by silica gel chromatography (100% dichloromethane→30% ethyl acetate/dichloromethane) gave the title compound as a racemic mixture. Chiral separation of the individual enantiomers was accomplished by use of HPLC using a 10 cm Chiral Pak® AD® column (60% EtOH/hexanes with 0.1% diethylamine) to give the title compound (1st eluting enantiomer, 200 mg). MS 372.1 (M).

Provenance & Evidence