Ammonium Chloride → HCID 86685862, compound

Participants

Reaction Conditions

Reaction Steps

A solution of Intermediate 11B (2.67 g, 8.44 mmol) and N,O-dimethylhydroxylamine hydrochloride (1.65 g, 16.9 mmol) in anhydrous THF (35 mL) was cooled to −61° C. (CHCl3/dry ice) under an atmosphere of Ar. To this solution was added 0.5 M isopropylmagnesium chloride (16.9 mL, 33.8 mmol) in THF slowly via a syringe. The reaction was stirred at −61° C. for 1.5 h, warmed to −20° C. (sat'd aq NaCl/ice) and stirred for 40 min, then warmed to 0° C. and stirred for 20 min. The reaction was poured into 10 mL of sat'd aq NH4Cl and 12 mL of water, and then extracted with EtOAc. The organic layer was washed with sat'd aq NaCl, dried over anhydrous MgSO4, filtered and concentrated. The residue was purified by silica gel chromatography eluting with EtOAc in hexanes to provide Intermediate 11C (1.62 g, 58%) as a light brown oil. LCMS Anal. Calc'd for C16H20F3NO3 331.33, found [M+H] 332.2.

Provenance & Evidence