Sodium cyanoborohydride → HCID 86684460, compound

Participants

Reaction Conditions

Reaction Steps

A 250-mL single-neck round-bottomed flask equipped with a magnetic stirrer and a reflux condenser was charged with 243e (2.2 g, 6.3 mmol), NaBH3CN (995 mg, 15.8 mmol), oxetan-3-one (907 mg, 12.6 mmol), zinc chloride (2.1 g, 15.8 mmol), and methanol (60 mL). The reaction mixture was stirred at 50° C. for 5 hrs and concentrated under reduced pressure. To the residue was added water and the resulting mixture was extracted with dichloromethane three times. The combined organic layer was then concentrated under reduced pressure and the resulting residue was purified by silica-gel column chromatography eluting with 1% triethylamine in methanol. The fractions containing the desired product were concentrated under reduced pressure. Dichloromethane was added to the residue and the resulting suspension was filtered. The filtrate was concentrated under reduced pressure afford 243f as a yellow solid (800 mg, 62%). MS-ESI: [M+H]+ 408.2

Provenance & Evidence