Acetic Acid → (6R,9R)-6-(2,3-difluorophenyl)-3-(dimethylamino)-6,7,8,9-tetrahydro-5H-cyclohepta[b]pyridin-9-ol

Participants

Reaction Steps

SODIUM CYANOBOROHYDRIDE (242 mg, 3.86 mmol) was added to the Acetonitrile (2 mL) solution of (6R,9R)-3-amino-6-(2,3-difluorophenyl)-6,7,8,9-tetrahydro-5H-cyclohepta[b]pyridin-9-ol (56 mg, 0.193 mmol) and FORMALDEHYDE (1 mL, 13.43 mmol) at rt. The reaction was stirred at room temperature for 4 hours. ACETIC ACID (0.5 mL, 8.73 mmol) was added to the reaction mixture (Caution: heat generation was observed to cause acetonitrile reflux) and the reaction was stirred overnight. Volatile was removed mostly via vacuum and the crude was added NaOH (1N), extracted with ethyl acetate twice. The ethyl acetate layer was dried (Na2SO4), filtered and concentrated. Flash column by methanol in CH2Cl2 from 0 to 4% gave the desired product (27.6 mg, 45%). MS(ESI)[M+H+]=319.35.

Provenance & Evidence