2-Methyl-N-(oxetan-3-ylidene)propane-2-sulfinamide → HCID 69932798, compound

Participants

Reaction Conditions

Reaction Steps

A solution of n-Butylllithium in hexanes (2.5M, 3.83 mL, 9.59 mmol, 2.0 equiv) was added dropwise to a solution of 3-(3-bromophenyl)-5-[4-(dimethoxymethyl)phenoxy]-1-ethyl-1H pyrazole (2.0 g, 4.79 mmol, 1.0 equiv) in THF (32 mL) at −78° C. To this mixture was added dropwise a solution of 2-methyl-N-oxetane-3-ylidenepropane-2-sulfinamide (0.840 g, 4.79 mmol, 1.0 equiv, Example 95, Step 4) in 5 mL THF. The reaction mixture was stirred at −78° C. for 10 minutes and the cooling bath was removed. Saturated aqueous ammonium chloride solution was added, and the crude product was partitioned between ethyl acetate and water. The organic layer was washed with saturated aqueous sodium chloride solution and dried over magnesium sulfate. The dried solution was filtered and the filtrate was concentrated. The residue was purified by flash chromatography on silica gel (0-100% ethyl acetate:hexanes then flushing with 10% methanol/dichloromethane) to afford N-[3-{3-{5-[4-(dimethoxymethyl)phenoxy]-1-ethyl-1H-pyrazol-3-yl}phenyl)oxetan-3-yl]-2-methylpropane-2-sulfinamide (2.17 g, 4.22 mmol, 88% yield). Calc'd (M+1)+501.23. Found: 468.1. Found mass is aldehyde formed from deprotection of acetal on LCMS.

Provenance & Evidence