Triethylamine → HCID 18472369, compound

Participants

Reaction Conditions

Reaction Steps

In THF (10 ml) was dissolved ethyl 7-morpholino-5-oxo-2,3,4,5-tetrahydro-1-benzoxepine-4-carboxylate (924 mg, 2.89 mmol), and to the mixture was added at −30° C. a solution of sodium boro hydride (164 mg, 4.34 mmol) in methanol (3 ml). The mixture was stirred at −20° C. to −15° C. for 30 minutes, and the mixture was cooled to −50° C., to which was added water (15 ml). The mixture was extracted with ethyl acetate (15 ml×3), and the organic layer was dried with anhydrous magnesium sulfate and concentrated under reduced pressure. The residue was dissolved in THF (10 ml), and to the mixture were added at 0° C. triethylamine (2.02 ml, 14.5 mmol) and methanesulfonylchloride (0.336 ml, 4.34 mmol). The mixture was stirred at room temperature for 17 hours and concentrated under reduced pressure. To the residue was added water (15 ml), and the mixture was extracted with ethyl acetate (20 ml×3). The organic layer was dried with anhydrous sodium sulfate and concentrated under reduced pressure. The residue was purified with column chromatography (silica gel 30 g, ethyl acetate/hexane=1/5), and the desired fraction was concentrated under reduced. pressure to give ethyl 7-morpholino-2,3-dihydro-1-benzoxepine-4-carboxylate (691 mg, 2.28 mmol, 79%). IR (KBr): 1703 cm−1.

Provenance & Evidence