1-Ethyl-3-(3'-dimethylaminopropyl)carbodiimide → (2S)-N-[(3aS,4R,6aR)-2-benzyloctahydrocyclopenta[c]pyrrol-4-yl]-2-phenylbutanamide

HRID 2363450Notes

Reaction equation

HRID 2363450 reaction equation
[C:1]1([C@H:7]([CH2:11][CH3:12])[C:8]([OH:10])=O)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.ON1C2C=CC=CC=2N=N1.CN(C)CCCN=C=NCC.[CH2:34]([N:41]1[CH2:45][C@H:44]2[C@H:46]([NH2:49])[CH2:47][CH2:48][C@H:43]2[CH2:42]1)[C:35]1[CH:40]=[CH:39][CH:38]=[CH:37][CH:36]=1>ClCCl>[CH2:34]([N:41]1[CH2:45][C@H:44]2[C@H:46]([NH:49][C:8](=[O:10])[C@H:7]([C:1]3[CH:2]=[CH:3][CH:4]=[CH:5][CH:6]=3)[CH2:11][CH3:12])[CH2:47][CH2:48][C@H:43]2[CH2:42]1)[C:35]1[CH:36]=[CH:37][CH:38]=[CH:39][CH:40]=1

Participants

6

Reactant 4

HCID 159081-Ethyl-3-(3'-dimethylaminopropyl)carbodiimideHCID 757711-HydroxybenzotriazoleHCID 785329(S)-2-Phenylbutyric acidHCID 25918977(3aS,4R,6aR)-2-benzyloctahydrocyclopenta[c]pyrrol-4-amine

Product 1

HCID 54673710(2S)-N-[(3aS,4R,6aR)-2-benzyloctahydrocyclopenta[c]pyrrol-4-yl]-2-phenylbutanamide

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Procedure

(S)-2-Phenylbutanoic acid (41.7 mg, 0.254 mmol), 1-hydroxybenzotriazole (38.9 mg, 0.254 mmol), and N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide (0.045 mL, 0.254 mmol) were combined in dichloromethane (1 mL). The reaction was stirred at room temperature for 10 minutes, and then (3aS,4R,6aR)-2-benzyloctahydrocyclopenta[c]pyrrol-4-amine (50 mg, 0.231 mmol) from Step E was added in 0.5 mL of dichloromethane. The reaction was stirred at room temperature for 20 hours, and then quenched with 0.5 mL of water. The organic layer was separated. The crude material was chromatographed using a silica gel cartridge (Analogix®, Burlington, Wis., RS-4) eluting with 1-10% methanol(ammonia)/dichloromethane to give the title compound: 1H NMR (400 MHz, pyridine-d5) δ ppm 8.47 (d, J=7.0, 1H), 7.59 (m, 2H), 7.42 (d, J=7.1, 2H), 7.34 (dd, J=7.6, 16.5, 4H), 7.25 (dt, J=5.0, 10.1, 2H), 4.45-4.29 (m, 1H), 3.62-3.51 (m, 2H), 3.44 (d, J=13.2, 1H), 2.85 (dd, J=2.7, 9.0, 1H), 2.58-2.50 (m, 1H), 2.50-2.42 (m, 2H), 2.40-2.31 (m, 1H), 2.31-2.22 (m, 2H), 1.97 (dq, J=6.1, 12.1, 1H), 1.85 (td, J=6.9, 13.6, 1H), 1.74 (dt, J=6.4, 14.3, 1H), 1.46 (dt, J=7.1, 19.2, 1H), 1.31 (dt, J=6.2, 20.5, 1H), 0.96 (dd, J=5.5, 9.1, 3H); MS (ESI+) m/z 363 (M+H)+.

Workup

  1. stirringThe reaction was stirred at room temperature for 20 hours
  2. customquenched with 0.5 mL of water
  3. customThe organic layer was separated
  4. customThe crude material was chromatographed
  5. washeluting with 1-10% methanol(ammonia)/dichloromethane

Sources & evidence

ORD record
ord-7a085cdf0986433c8e09c16c933f691a
Source dataset
uspto-grants-2014_04
Patent number
US08691865B2

Reaction notes

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