Triethylamine → tert-Butyl [(1R,3S)-3-isopropyl-3-({4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-yl}carbonyl)cyclopentyl]carbamate

HRID 1261642Notes

Reaction equation

HRID 1261642 reaction equation
[F:1][C:2]([F:16])([F:15])[C:3]1[CH:8]=[CH:7][N:6]=[C:5]([N:9]2[CH2:14][CH2:13][NH:12][CH2:11][CH2:10]2)[CH:4]=1.[C:17]([O:21][C:22]([NH:24][C@@H:25]1[CH2:29][CH2:28][C@:27]([CH:33]([CH3:35])[CH3:34])([C:30](O)=[O:31])[CH2:26]1)=[O:23])([CH3:20])([CH3:19])[CH3:18].F[P-](F)(F)(F)(F)F.N1(O[P+](N(C)C)(N(C)C)N(C)C)C2C=CC=CC=2N=N1.C(N(CC)CC)C>C(Cl)Cl.CCOC(C)=O>[CH:33]([C@:27]1([C:30]([N:12]2[CH2:11][CH2:10][N:9]([C:5]3[CH:4]=[C:3]([C:2]([F:15])([F:1])[F:16])[CH:8]=[CH:7][N:6]=3)[CH2:14][CH2:13]2)=[O:31])[CH2:28][CH2:29][C@@H:25]([NH:24][C:22](=[O:23])[O:21][C:17]([CH3:19])([CH3:18])[CH3:20])[CH2:26]1)([CH3:35])[CH3:34]

Participants

7

Reactant 4

HCID 8471TriethylamineHCID 151348Benzotriazol-1-yloxy-tris(dimethylamino)phosphonium hexafluorophosphateHCID 112184921-[4-(Trifluoromethyl)pyridin-2-yl]piperazineHCID 60122293(1S,3R)-3-((Tert-butoxycarbonyl)amino)-1-isopropylcyclopentanecarboxylic acid

Product 1

HCID 59833580tert-Butyl [(1R,3S)-3-isopropyl-3-({4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-yl}carbonyl)cyclopentyl]carbamateYield 59.5%

Reagents, catalysts & solvents 2

HCID 6344DichloromethaneSolventHCID 8857Ethyl AcetateSolvent

Procedure

To a solution of 1-[4-(trifluoromethyl)pyridin-2-yl]piperazine (145 mg, 0.627 mmol), (1S,3R)-3-[(tert-butoxycarbonyl)amino]-1-isopropylcyclopentanecarboxylic acid (140 mg, 0.52 mmol) in methylene chloride (10 mL) was added benzotriazol-1-yloxytris(dimethylamino)phosphonium hexafluorophosphate (253 mg, 0.572 mmol) followed by triethylamine (0.156 mL, 1.12 mmol). After being stirred overnight, the reaction mixture was diluted with EtOAc and washed with saturated NaHCO3. The aqueous layer was extracted with EtOAc three times. The combined organic layers were dried (MgSO4), concentrated and purified by flash chromatography on silica gel (20% EtOAc/hexanes to 40% EtOAc/hexanes) to give 0.15 g of desired product. MS calculated for C24H35F3N4O3: (M+H) 485; found 385.2 (M-Boc+H).

Workup

  1. washwashed with saturated NaHCO3
  2. extractionThe aqueous layer was extracted with EtOAc three times
  3. dry with materialThe combined organic layers were dried (MgSO4)
  4. concentrationconcentrated
  5. custompurified by flash chromatography on silica gel (20% EtOAc/hexanes to 40% EtOAc/hexanes)

Sources & evidence

ORD record
ord-15a7cdb908024d42a5736c2bad91456f
Source dataset
uspto-grants-2013_06
Patent number
US08470827B2

Reaction notes

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