Toluene → HCID 68469873, compound

Participants

Reaction Steps

3.86 g (16.1 mmol) ethyl 4-oxo-4,5,7,8-tetrahydro-thieno[2,3-d]azepine-6-carboxylate (prepared analogously to WO2007/84622) in 50 ml methylene chloride are combined, under argon, at −25° C., first with 1.92 ml of a 1.0 M toluene solution of (S)-3,3-diphenyl-1-methyl-tetrahydro-1H,3H-pyrrolo[1,2-c][1,3,2]oxazaborolidine and then with 20.2 ml of a 2 M borane-dimethylsulphide complex-toluene solution in 70 ml methylene chloride, and chilled to −18° C. for 3 days. Then sat. NH3Cl solution is added and the mixture is extracted 3× with methylene chloride. The combined organic phases are dried with NaSO4, concentrated and the crude product is purified by flash chromatography on silica gel (eluant DCM/methanol 95:5).

Provenance & Evidence