1-Ethyl-3-(3'-dimethylaminopropyl)carbodiimide → tert-butyl(R)-1-((3aS,4R,6aR)-4-(2,2-dicyclohexylacetamido)hexahydrocyclopenta[c]pyrrol-2(1H)-yl)-4-methyl-1-oxopentan-2-ylcarbamate

HRID 1092565

Reaction equation

HRID 1092565 reaction equation
[C:1]([O:5][C:6]([NH:8][C@@H:9]([C:14]([OH:16])=O)[CH2:10][CH:11]([CH3:13])[CH3:12])=[O:7])([CH3:4])([CH3:3])[CH3:2].[CH:17]1([CH:23]([CH:35]2[CH2:40][CH2:39][CH2:38][CH2:37][CH2:36]2)[C:24]([NH:26][C@H:27]2[C@H:34]3[C@H:30]([CH2:31][NH:32][CH2:33]3)[CH2:29][CH2:28]2)=[O:25])[CH2:22][CH2:21][CH2:20][CH2:19][CH2:18]1.OC1C2N=NNC=2C=CC=1.CN(C)CCCN=C=NCC>ClCCl>[CH:35]1([CH:23]([CH:17]2[CH2:22][CH2:21][CH2:20][CH2:19][CH2:18]2)[C:24]([NH:26][C@H:27]2[C@H:34]3[C@H:30]([CH2:31][N:32]([C:14](=[O:16])[C@H:9]([NH:8][C:6](=[O:7])[O:5][C:1]([CH3:2])([CH3:3])[CH3:4])[CH2:10][CH:11]([CH3:12])[CH3:13])[CH2:33]3)[CH2:29][CH2:28]2)=[O:25])[CH2:36][CH2:37][CH2:38][CH2:39][CH2:40]1

Participants

6

Reactant 4

HCID 159081-Ethyl-3-(3'-dimethylaminopropyl)carbodiimideHCID 637604tert-Butoxycarbonyl-D-leucineHCID 546741702,2-dicyclohexyl-N-[(3aS,4R,6aR)-octahydrocyclopenta[c]pyrrol-4-yl]acetamideHCID 178418300HCID 178418300, compound

Product 1

HCID 131729483tert-butyl(R)-1-((3aS,4R,6aR)-4-(2,2-dicyclohexylacetamido)hexahydrocyclopenta[c]pyrrol-2(1H)-yl)-4-methyl-1-oxopentan-2-ylcarbamate

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

N-(tert-Butoxycarbonyl)-D-leucine (72.7 mg, 0.314 mmol), 2,2-dicyclohexyl-N-[(3aS,4R,6aR)-octahydrocyclopenta[c]pyrrol-4-yl]acetamide (95 mg, 0.286 mmol) from Example 74, and hydroxybenzotriazole (48.1 mg, 0.314 mmol) were combined in dichloromethane (10 mL). After 20 minutes, N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide (0.056 mL, 0.314 mmol) was added, and the reaction mixture was stirred at room temperature for 18 hours. The reaction was quenched with water. The separated organic layer was reduced in volume, and the crude material was applied to a silica gel cartridge (Analogix®, Burlington, Wis., RS-12) and eluted first with 10% to 100% ethyl acetate/hexanes and then with 1-10% methanol (2 N ammonia)/dichloromethane to give tert-butyl(R)-1-((3aS,4R,6aR)-4-(2,2-dicyclohexylacetamido)hexahydrocyclopenta[c]pyrrol-2(1H)-yl)-4-methyl-1-oxopentan-2-ylcarbamate: 1H NMR (500 MHz, pyridine-d5) δ ppm 8.26 (dd, J=7.2, 24.0, 1H), 7.91 (d, J=8.6, 1H), 4.48-4.36 (m, 1H), 4.12-3.96 (m, 1H), 3.87 (dd, J=7.4, 10.3, 1H), 3.70 (ddd, J=8.0, 14.4, 23.7, 1H), 3.40 (dd, J=5.7, 12.3, 1H), 2.77 (s, 1H), 2.58 (d, J=6.1, 1H), 2.08 (s, 1H), 2.01 (dd, J=5.6, 10.4, 2H), 1.96-1.55 (m, 17H), 1.54-1.50 (m, 9H), 1.49-1.37 (m, 2H), 1.19 (qdd, J=12.3, 22.3, 24.7, 11H), 1.00 (t, J=6.6, 3H), 0.88 (d, J=6.6, 1H).

Workup

  1. customThe reaction was quenched with water
  2. washeluted first with 10% to 100% ethyl acetate/hexanes

Sources & evidence

ORD record
ord-320bc4fc329e4f45a24332e01f4b3703
Source dataset
uspto-grants-2012_03
Patent number
US08129417B2

Linked notes

Loading…