反应详情

Crude (3R)-N-((S)-3-azido-1-phenylpropan-2-yl)-3-((S)-1-hydroxy-5-methoxy-1-phenylpentyl)piperidine-1-carboxamide (210.7 mg, 91% purity, 0.4 mmol) from the previous step was dissolved in MeOH (10 mL) and was added to 0.2 g of Pd/C previously wetted with a drop of H2O. After 3 vacuum/purge cycles using 12 torr vacuum and 14 psi H2, the reaction was stirred under an atmosphere of H2 at 14 psi for 30 minutes. The crude mixture was filtered through a plug of Celite and the solvent was removed. The resulting oil was dissolved in a minimal volume of 1:1 acetonitrile:H2O then separated by prep HPLC on a C-18 column using a gradient of 0.05% TFA in H2O and acetonitrile. Appropriate fractions were combined, made slightly basic with 1 N NaOH, and the solvent was removed at 50° C. and 150 torr. The residue was taken up in CH2Cl2 (50 mL) and 1 N NaOH (10 mL). The organic layer was dried (Na2SO4), decanted and stripped to afford (3R)-N-((S)-1-amino-3-phenylpropan-2-yl)-3-((S)-1-hydroxy-5-methoxy-1-phenylpentyl)piperidine-1-carboxamide (61.5 mg, 34% overall yield from (R)-3-((S)-1-hydroxy-5-methoxy-1-phenylpentyl)piperidine-1-carbonyl chloride) as a clear colorless film. MS ESI +ve m/z 454 (M+1).

1. customAfter 3 vacuum/purge cycles
2. filtrationThe crude mixture was filtered through a plug of Celite
3. customthe solvent was removed
4. dissolutionThe resulting oil was dissolved in a minimal volume of 1:1 acetonitrile
5. customH2O then separated by prep HPLC on a C-18 column
6. customthe solvent was removed at 50° C.
7. dry with materialThe organic layer was dried (Na2SO4)
8. customdecanted