1,2-Dichloroethane → 1-[2-(4-Amino-3-chloro-benzoylamino)-3,3-dimethyl-butyryl]-pyrrolidine-2-carboxylic acid tert-butyl ester

HRID 1750931Notes

Reaction equation

HRID 1750931 reaction equation
[C:1]([O:5][C:6]([CH:8]1[CH2:12][CH2:11][CH2:10][N:9]1[C:13](=[O:30])[CH:14]([NH:19][C:20]([O:22]CC1C=CC=CC=1)=O)[C:15]([CH3:18])([CH3:17])[CH3:16])=[O:7])([CH3:4])([CH3:3])[CH3:2].[NH2:31][C:32]1[CH:40]=[CH:39][C:35](C(O)=O)=[CH:34][C:33]=1[Cl:41].CCN(C(C)C)C(C)C.C(Cl)CCl>CO.CCOC(C)=O.C(Cl)Cl.CN(C=O)C.[Pd]>[C:1]([O:5][C:6]([CH:8]1[CH2:12][CH2:11][CH2:10][N:9]1[C:13](=[O:30])[CH:14]([NH:19][C:20](=[O:22])[C:35]1[CH:39]=[CH:40][C:32]([NH2:31])=[C:33]([Cl:41])[CH:34]=1)[C:15]([CH3:17])([CH3:18])[CH3:16])=[O:7])([CH3:4])([CH3:2])[CH3:3]

Participants

9

Reactant 4

HCID 111,2-DichloroethaneHCID 172114-Amino-3-chlorobenzoic acidHCID 81531DiisopropylethylamineHCID 666982781-(2-Benzyloxycarbonylamino-3,3-dimethyl-butyryl)-pyrrolidine-2-carboxylic acid tert-butyl ester

Product 1

HCID 102034841-[2-(4-Amino-3-chloro-benzoylamino)-3,3-dimethyl-butyryl]-pyrrolidine-2-carboxylic acid tert-butyl esterYield 97%

Reagents, catalysts & solvents 4

HCID 23938PalladiumCatalystHCID 887MethanolSolventHCID 8857Ethyl AcetateSolvent2×HCID 22350042dichloromethane N,N-dimethylformamideSolvent

Conditions

Temperature
0 °C

Procedure

To a solution of 3 (19.0 g, 45.4 mmol) in MeOH (200 mL) was added 10% activated Pd on C (2.0 g) in EtOAc (50 mL) and the reaction stirred under H2 for 18 hours. The solution was filtered through Celite and the solvent evaporated to yield a viscous, colorless oil. The free amine was dissolved in dry CH2Cl2/DMF (2:1, 120 mL), the solution cooled to 0° C. and 4-amino-3-chlorobenzoic acid (7.79 g, 45.4 mmol) and DIPEA (7.90 mL, 45.4 mmol) were added. The reaction was stirred for 10 minutes, then EDC (11.32 g, 59.1 mmol) was added. The mixture was stirred at 0° C. for 30 minutes then at room temperature for 18 hours. The solution was diluted with EtOAc (300 mL), washed with 0.5N NaHSO4 (2×250 mL), 10% NaHCO3 (2×250 mL), saturated NaCl (150 mL), dried over MgSO4, and evaporated to dryness. Flash column chromatography on silica gel using CH2Cl2/MeOH, (99/1 to 98/2%) yielded the title compound as a white solid (19.25 g, 97% yield): 1H-NMR (500 MHz, CDCl3) δ 1.12 (s, 9H), 1.48 (s, 9H), 1.85-1.99 (m, 2H), 2.01-2.13 (m, 1H), 2.18-2.29 (m, 1H), 3.63-3.73 (m, 1H), 3.84-3.93 (m, 1H), 4.30-4.41 (m, 1H), 4.86 (d, 1H), 6.73 (d, 1H), 7.51 (d, 1H), 7.73 (s, 1H). Analytical HPLC (cyano column): 12.59 min. LC-MS (ES+) m/e=438.5 (M+H).

Workup

  1. filtrationThe solution was filtered through Celite
  2. customthe solvent evaporated
  3. customto yield a viscous, colorless oil
  4. stirringThe reaction was stirred for 10 minutes
  5. stirringThe mixture was stirred at 0° C. for 30 minutes
  6. waitat room temperature for 18 hours
  7. washwashed with 0.5N NaHSO4 (2×250 mL), 10% NaHCO3 (2×250 mL), saturated NaCl (150 mL)
  8. dry with materialdried over MgSO4
  9. customevaporated to dryness

Sources & evidence

ORD record
ord-a04add2813da46aaa631202b1b3f16ac
Source dataset
uspto-grants-2015_10
Patent number
US09156880B2

Reaction notes

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