4-Methylmorpholine → HCID 15521370, compound

Participants

Reaction Conditions

Reaction Steps

A solution of 2-[(4-methoxybenzenesulfonyl)methyl]-3-phenyl-propionic acid (1.05 g, 3.14 mmol) and 0.69 mL (6.3 mmol) of NMM in dry THF, under nitrogen, is cooled in an ice bath. Ethyl chloroformate (0.33 mL, 3.5 mmol) in 7 mL of THF is added dropwise over 5 minutes. The suspension is stirred at 0° C. for 10 minutes, after which a slurry of O-benzylhydroxylamine hydrochloride (0.64 g, 4 mmol) and NMM (0.44 mL, 4 mmol) in 7 mL of THF is introduced in several portions. The mixture is stirred for 10 minutes and stored at 10° C. overnight. The mixture is allowed to warm to room temperature for 0.5 hours, and is then partitioned between ethyl acetate and aqueous 10% HCl. The organic phase is washed with water, three portions of 1M sodium bicarbonate and brine. It is dried over anhydrous sodium sulfate, concentrated and chromatographed on silica gel, eluting with 40%-50% ethyl acetate in hexanes. This affords 1.26 g of the title compound as a colorless oil.

Provenance & Evidence