Tetrahydrothiopyran-4-one → HCID 21878144, compound

Participants

Reaction Conditions

Reaction Steps

A solution of 2-methylpropyl 4-bromophenylcarbamate (Step 1, 10.0 g, 36.7 mmol) in anhydrous tetrahydrofuran (184 mL) at −78° C. under N2 was treated n-butyllithium (1.6M in hexanes, 48.2 mL, 77.1 mmol) dropwise over 20 mins, and the mixture was stirred at −78° C. for 45 mins. The resulting slurry was then treated with a solution of tetrahydro-2H-thiopyran-4-one (4.48 g, 38.5 mmol) in anhydrous tetrahydrofuran (38 mL) dropwise over 5 mins to give an opaque mixture which was allowed to slowly warm to 0° C. with stirring over approximately 2.5 hrs. The mixture was then quenched by the slow addition of saturated aqueous ammonium chloride (75 mL), water (75 mL) was added, and the layers were separated. The organic phase was washed with water (50 mL) and saline (50 mL), dried over anhydrous magnesium sulfate and concentrated under reduced pressure, and the crude product was recrystallized from EtOAc/hexanes to give the title compound, mp 150-151° C.; MS (ESI−) for C16H23NO3S m/z 308 (M−H)−.

Provenance & Evidence