4-Methylmorpholine → HCID 10223239, compound

Participants

Reaction Steps

A solution (3R)-6-cyclohexyl-3-(3-{[[2-(dimethylamino)ethyl](methyl)amino]carbonyl}-1,2,4-oxadiazol-5-yl)hexanoic acid (Preparation 82) (450 mg, 0.72 mmol) and N-methylmorpholine (284 μl, 2.53 mmol) in dichloromethane (10 ml) was cooled to 0° C., treated with isobutyl chloroformate (112 μl, 0.87 mmol) and stirred under an argon atmosphere for 1 hour. O-(Trimethylsilyl)hydroxylamine (355 μl, 2.90 mmol) was added and the mixture was stirred for 3.5 hours, being allowed to warm to room temperature over this time. The mixture was then treated with methanol (2.5 ml) and stirred at room temperature for 20 minutes. The solvent was removed under reduced pressure. The residue was dissolved in ethyl acetate (100 ml) and washed with water (20 ml), dried over anhydrous magnesium sulphate, filtered and the solvent removed under reduced pressure. The solid was purified by column chromatography on silica gel eluting with a gradient system of 97:3:0.3 (dichloromethane:methanol:ammonia) gradually changing to 90:10:1 (dichloromethane:methanol:ammonia) to afford the title compound as a gum (123 mg).

Provenance & Evidence