4-Methylmorpholine → 1-(2(S)-tert-Butoxycarbonylamino-non-8-enoyl)-4(R)-hydroxy-pyrrolidine-2(S)-carboxylic acid methyl ester

HRID 17809Notes

Reaction equation

HRID 17809 reaction equation
[C:1]([O:5][C:6]([NH:8][C@@H:9]([CH2:13][CH2:14][CH2:15][CH2:16][CH2:17][CH:18]=[CH2:19])[C:10]([OH:12])=O)=[O:7])([CH3:4])([CH3:3])[CH3:2].Cl.[CH3:21][O:22][C:23]([C@@H:25]1[CH2:29][C@@H:28]([OH:30])[CH2:27][NH:26]1)=[O:24].CN1CCOCC1.CN(C(ON1N=NC2C=CC=NC1=2)=[N+](C)C)C.F[P-](F)(F)(F)(F)F>C(Cl)Cl.C(OCC)(=O)C.C(OCC)(=O)C.CCCCCC>[CH3:21][O:22][C:23]([C@@H:25]1[CH2:29][C@@H:28]([OH:30])[CH2:27][N:26]1[C:10](=[O:12])[C@@H:9]([NH:8][C:6]([O:5][C:1]([CH3:2])([CH3:3])[CH3:4])=[O:7])[CH2:13][CH2:14][CH2:15][CH2:16][CH2:17][CH:18]=[CH2:19])=[O:24]

Participants

8

Reactant 4

HCID 79724-MethylmorpholineHCID 9886157Methanaminium, N-((dimethylamino)(3H-1,2,3-triazolo(4,5-b)pyridin-3-yloxy)methylene)-N-methyl-, hexafluorophosphate(1-) (1:1)HCID 114353194-Hydroxy-L-proline methyl ester hydrochlorideHCID 11507316(2S)-N-Boc-amino-non-8-enoic acid

Product 1

HCID 587986201-(2(S)-tert-Butoxycarbonylamino-non-8-enoyl)-4(R)-hydroxy-pyrrolidine-2(S)-carboxylic acid methyl esterYield 100%

Reagents, catalysts & solvents 3

HCID 6344DichloromethaneSolventHCID 8857Ethyl AcetateSolventHCID 21226206Ethyl acetate hexaneSolvent

Procedure

A solution of 2(S)-tert-butoxycarbonylamino-8-nonenoic acid (purchased from RSP Amino Acids)(3.5 g, 12.9 mmol) in 200 mL of DCM was treated sequentially with 4(R)-hydroxypyrrolidine-2(S)-carboxylic acid methyl ester hydrochloride (2.15 g, 11.8 mmol), N-methyl morpholine (4.25 mL, 38.6 mmol), and HATU (5.37 g, 14.1 mmol). The reaction mixture was stirred at rt under N2 for 3 days, and then concentrated in vacuo. The residue was partitioned between ethyl acetate and pH 4 buffer (biphthalate). The organic phase was washed with sat. aq. NaHCO3, dried (MgSO4), and concentrated in vacuo to give the crude product. Flash chromatography (50% ethyl acetate/hexane to 100% ethyl acetate) gave 4.7 g (˜100%) of 1-(2(S)-tert-Butoxycarbonylamino-non-8-enoyl)-4(R)-hydroxy-pyrrolidine-2(S)-carboxylic acid methyl ester as a colorless oil: 1H NMR (500 MHz, CD3OD) δ 1.33-1.50 (m, 8H), 1.46 (s, 9H), 1.57 (m, 1H), 1.72 (m, 1H) 2.08 (m, 2 H), 2.28 (m, 1H), 3.72 (s, 3H,) 3.75-3.87 (m, 2H), 4.36 (m, 1H), 4.51 (bs, 1 H), 4.57 (t, J=8.2 Hz, 1H), 4.95 (d, J=10.4 Hz, 1H), 5.01 (m, 1H), 5.83 (m, 1 H); MS m/z 399 (M++1).

Workup

  1. concentrationconcentrated in vacuo
  2. customThe residue was partitioned between ethyl acetate and pH 4 buffer (biphthalate)
  3. washThe organic phase was washed with sat. aq. NaHCO3
  4. dry with materialdried (MgSO4)
  5. concentrationconcentrated in vacuo
  6. customto give the crude product

Sources & evidence

ORD record
ord-7f94c41ef4a34740a19fe8838c5d7435
Source dataset
uspto-grants-2010_06
Patent number
US07741281B2

Reaction notes

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