Acetic Acid → tert-butyl 5-(benzylamino)hexahydrocyclopenta[c]pyrrole-2(1H)-carboxylate

HRID 1056631Notes

Reaction equation

O=[C:2]1[CH2:16][CH:5]2[CH2:6][N:7]([C:9]([O:11][C:12]([CH3:15])([CH3:14])[CH3:13])=[O:10])[CH2:8][CH:4]2[CH2:3]1.[CH2:17]([NH2:24])[C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1.CC(O)=O.[BH-](OC(C)=O)(OC(C)=O)OC(C)=O.[Na+]>C(Cl)Cl>[CH2:17]([NH:24][CH:2]1[CH2:16][CH:5]2[CH2:6][N:7]([C:9]([O:11][C:12]([CH3:15])([CH3:14])[CH3:13])=[O:10])[CH2:8][CH:4]2[CH2:3]1)[C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1

Participants

Conditions

Temperature: 0 °C

Procedure

To a solution of tert-butyl 5-oxohexahydrocyclopenta[c]pyrrole-2(1H)-carboxylate (9.57 g, 42.5 mmol) in DCM (170 mL) were added BnNH2 (4.56 g, 42.5 mmol) and AcOH (2.55 g, 42.5 mmol) at 0° C. and the reaction mixture was stirred at 0° C. for 0.5 h. Then NaBH(OAc)3 (18.00 g, 85.0 mmol) was added to the above mixture and the resulting mixture was stirred at rt for another 20 h, then quenched with saturated NaHCO3 solution (142 mL), and extracted with DCM (250 mL×3). The combined organic phases were washed with brine (250 mL×3), dried over anhydrous Na2SO4, concentrated in vacuo. The residue was purified by silica gel column chromatography (EtOAc) to give the title compound as a yellow solid (7.44 g, 55.3%).

Workup

stirringthe resulting mixture was stirred at rt for another 20 h
customquenched with saturated NaHCO3 solution (142 mL)
extractionextracted with DCM (250 mL×3)
washThe combined organic phases were washed with brine (250 mL×3)
dry with materialdried over anhydrous Na2SO4
concentrationconcentrated in vacuo
customThe residue was purified by silica gel column chromatography (EtOAc)

Sources & evidence

ORD record: ord-584136e711fc4879a0b1398d47ffa26d
Source dataset: uspto-grants-2016_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09399637B2

Reaction notes

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