Trifluoroacetic acid → HCID 67572480, compound

Participants

Reaction Steps

To a solution of the product from Step E (360 mg, 0.686 mmol) in 6 mL of dichloromethane was added at room temperature dropwise 3 mL of trifluoroacetic acid. After 30 minutes, the solution was concentrated in vacuo. The resulting product was reconcentrated from benzene three times to remove excess trifluoroacetic acid. To a solution of the amine salt in 4.2 mL of 1,2-dichloroethane at 0° C. was added 4 Å powdered molecular sieves, followed by sodium triacetoxyborohydride (363 mg, 1.71 mmol). The aldehyde from Step E of Example 1 (159 mg, 0.754 mmol) was added at 0° C., followed by N-methylmorpholine (0.076 mL, 0.69 mmol). The reaction was stirred overnight, allowing it to warm to room temperature. The reaction was poured into EtOAc, washed with sat. aq. NaHCO3 and brine, dried (Na2SO4), filtered, and concentrated in vacuo. The resulting product was purified by silica gel chromatography (50-75% acetone/hexane) to provide the desired product. A portion of this was taken up in CH2Cl2 and treated with excess HCl/Et2O, then stripped to provide the titled compound.

Provenance & Evidence