Dimethylformamide → (2R,4S)-2-methyl-4-((2-methylpropan-2-yl)oxycarbonylamino)-5-(4-phenylphenyl)pentanoic acid

HRID 1641661Notes

Reaction equation

HRID 1641661 reaction equation
[C:1]1([C:23]2[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=2)[CH:6]=[CH:5][C:4]([CH2:7][C@@H:8]([NH:15][C:16]([O:18][C:19]([CH3:22])([CH3:21])[CH3:20])=[O:17])[CH2:9][C@@H:10]([CH3:14])[C:11]([OH:13])=[O:12])=[CH:3][CH:2]=1.CN(C)C=O.C(=O)([O-])[O-].[Cs+].[Cs+].[CH2:40](I)[CH3:41]>O>[CH2:40]([O:12][C:11](=[O:13])[C@H:10]([CH3:14])[CH2:9][C@H:8]([NH:15][C:16]([O:18][C:19]([CH3:22])([CH3:20])[CH3:21])=[O:17])[CH2:7][C:4]1[CH:3]=[CH:2][C:1]([C:23]2[CH:24]=[CH:25][CH:26]=[CH:27][CH:28]=2)=[CH:6][CH:5]=1)[CH3:41].[C:1]1([C:23]2[CH:24]=[CH:25][CH:26]=[CH:27][CH:28]=2)[CH:2]=[CH:3][C:4]([CH2:7][C@@H:8]([NH:15][C:16]([O:18][C:19]([CH3:22])([CH3:20])[CH3:21])=[O:17])[CH2:9][C@@H:10]([CH3:14])[C:11]([OH:13])=[O:12])=[CH:5][CH:6]=1

Participants

7

Reactant 4

HCID 6228DimethylformamideHCID 6340IodoethaneHCID 10796Cesium carbonateHCID 46193546(2R,4S)-2-methyl-4-((2-methylpropan-2-yl)oxycarbonylamino)-5-(4-phenylphenyl)pentanoic acid

Product 2

HCID 46193546(2R,4S)-2-methyl-4-((2-methylpropan-2-yl)oxycarbonylamino)-5-(4-phenylphenyl)pentanoic acidHCID 58027501(2R,4S)-5-biphenyl-4-yl-4-tert-butoxycarbonylamino-2-methylpentanoic acid ethyl ester

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

50 g of (2R,4S)-5-biphenyl-4-yl-4-tert-butoxycarbonylamino-2-methylpentanoic acid (3-a, R1=BOC, R2=R3=H) is added to dimethylformamide (80 ml). Cesium carbonate (69 g) is then added. Ethyl iodide (13.6 g) is then added and the mixture is stirred overnight at room temperature. Water (200 ml) is added to the mixture and the mixture is then extracted with isopropyl acetate (2×200 ml). The combined organic phases are washed with brine, dried (MgSO4) and concentrated in vacuo to give (2R,4S)-5-biphenyl-4-yl-4-tert-butoxycarbonylamino-2-methylpentanoic acid ethyl ester (3-a, R1=BOC, R2=H, R3=Et) (56 g). 1H NMR (DMSO): 1.12 (3H), 1.19 (3H), 1.36 (9H), 1.53 (1H), 1.84 (1H), 2.55 (1H), 2.75 (2H), 3.74 (1H), 4.05 (2H), 6.04 (1H), 7.23 (2H), 7.30 (1H), 7.41 (2H), 7.50 (2H), 7.57 (2H). m/z (ES+): 412 ([MH]+, 100%), 356 (63), 312 (73).

Workup

  1. extractionthe mixture is then extracted with isopropyl acetate (2×200 ml)
  2. washThe combined organic phases are washed with brine
  3. dry with materialdried (MgSO4)
  4. concentrationconcentrated in vacuo

Sources & evidence

ORD record
ord-a676e2a8135745b18be1903854737926
Source dataset
uspto-grants-2012_02
Patent number
US08115016B2

Reaction notes

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