Acetic Acid → (3aR*,4S*,6aS*)-N-benzyl-2-(3-methyl-2-phenylbutanoyl)octahydrocyclopenta[c]pyrrol-4-amine

HRID 2363538Notes

Reaction equation

HRID 2363538 reaction equation
Cl.[NH2:2][C@@H:3]1[C@@H:10]2[C@@H:6]([CH2:7][N:8]([C:11](=[O:22])[CH:12]([C:16]3[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=3)[CH:13]([CH3:15])[CH3:14])[CH2:9]2)[CH2:5][CH2:4]1.[CH:23](=O)[C:24]1[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=1.C(O)(=O)C.C([BH3-])#N>ClCCl>[CH2:23]([NH:2][C@@H:3]1[C@@H:10]2[C@@H:6]([CH2:7][N:8]([C:11](=[O:22])[CH:12]([C:16]3[CH:17]=[CH:18][CH:19]=[CH:20][CH:21]=3)[CH:13]([CH3:15])[CH3:14])[CH2:9]2)[CH2:5][CH2:4]1)[C:24]1[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=1

Participants

6

Reactant 4

HCID 176Acetic AcidHCID 240BenzaldehydeHCID 498716Cyano-borohydrideHCID 665909011-((3aR,4S,6aS)-4-aminohexahydrocyclopenta[c]pyrrol-2(1H)-yl)-3-methyl-2-phenylbutan-1-one hydrochloric acid salt

Product 1

HCID 68413117(3aR*,4S*,6aS*)-N-benzyl-2-(3-methyl-2-phenylbutanoyl)octahydrocyclopenta[c]pyrrol-4-amine

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

1-((3aR,4S,6aS)-4-aminohexahydrocyclopenta[c]pyrrol-2(1H)-yl)-3-methyl-2-phenylbutan-1-one hydrochloric acid salt (49 mg, 0.152 mmol) and benzaldehyde (0.023 mL, 0.228 mmol) were combined in dichloromethane (1.5 mL). Acetic acid (1.5 mL) was added. The reaction was stirred at room temperature for 30 minutes, then PS-cyanoborohydride (64.9 mg, 0.152 mmol) was added. After 72 hours, LCMS of the reaction showed no more starting material. The reaction mixture was filtered, and the solvent was removed under a stream of nitrogen. The crude material was purified using a silica gel cartridge (Analogix®, Burlington, Wis., RS-4) eluting with 1-10% methanol (2 N ammonia)/dichloromethane to give the title compound: 1H NMR (500 MHz, pyridine-d5) δ ppm 7.69-7.60 (m, 2H), 7.54-7.44 (m, 2H), 7.44-7.34 (m, 5H), 7.29 (tdd, J=4.8, 7.8, 13.0, 2H), 3.90-3.36 (m, 4H), 3.29 (dd, J=3.8, 10.6, 0.5H), 2.99 (dd, J=5.7, 11.4, 0.5H), 2.93 (dd, J=6.0, 11.3, 0.5H), 2.75-2.63 (m, 1H), 2.59-2.48 (m, 1H), 2.46-2.31 (m, 1H), 2.25 (dt, J=4.1, 8.7, 0.5H), 1.97 (dt, J=9.3, 11.6, 1H), 1.93-1.85 (m, 0.5H), 1.84-1.74 (m, 1H), 1.65-1.55 (m, 0.5H), 1.51-1.35 (m, 1H), 1.33-1.21 (m, 1H), 1.18-1.10 (m, 3H), 1.01 (td, J=7.7, 13.1, 0.5H), 0.87 (dt, J=6.6, 12.9, 0.5H), 0.75 (t, J=7.2, 3H); MS (ESI+) m/z 377 (M+H)+.

Workup

  1. waitAfter 72 hours
  2. filtrationThe reaction mixture was filtered
  3. customthe solvent was removed under a stream of nitrogen
  4. customThe crude material was purified
  5. washeluting with 1-10% methanol (2 N ammonia)/dichloromethane

Sources & evidence

ORD record
ord-21322c890c5a433b8d99d1daa8fa7c02
Source dataset
uspto-grants-2014_04
Patent number
US08691865B2

Reaction notes

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