Ethanol → (2R,4S)-4-amino-5-(biphenyl-4-yl)-2-methylpentanoic acid ethyl ester hydrochloride

HRID 1641639Notes

Reaction equation

HRID 1641639 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(OC(C)(C)C)=O)[CH2:9][C@@H:10]([CH3:14])[C:11]([OH:13])=[O:12])=[CH:3][CH:2]=1.S(Cl)([Cl:31])=O.[CH2:33](O)[CH3:34]>>[ClH:31].[CH2:33]([O:13][C:11](=[O:12])[C@H:10]([CH3:14])[CH2:9][C@H:8]([NH2:15])[CH2:7][C:4]1[CH:5]=[CH:6][C:1]([C:23]2[CH:24]=[CH:25][CH:26]=[CH:27][CH:28]=2)=[CH:2][CH:3]=1)[CH3:34]

Participants

4

Reactant 3

HCID 702EthanolHCID 24386Thionyl ChlorideHCID 46193546(2R,4S)-2-methyl-4-((2-methylpropan-2-yl)oxycarbonylamino)-5-(4-phenylphenyl)pentanoic acid

Product 1

HCID 25017086(2R,4S)-4-amino-5-(biphenyl-4-yl)-2-methylpentanoic acid ethyl ester hydrochloride

Procedure

150 g (2R,4S)-5-biphenyl-4-yl-4-tert-butoxycarbonylamino-2-methylpentanoic acid (3-a, R1=BOC, R2=R3=H) were dissolved in 1500 ml ethanol at 70° C. 43 ml of thionyl chloride were then added over about 1 hour. The mixture was then stirred for a further 2 hours. The mixture was concentrated to dryness and then suspended in 3400 ml heptane. The precipitate was collected by filtration, yielding 133 g of (2R,4S)-4-amino-5-biphenyl-4-yl-2-methylpentanoic acid ethyl ester hydrochloride (3-a, R1=R2=H, R3=Et). 1H-NMR (DMSO): 1.05 (3H, t, 1-CH3); 1.08 (3H, t, CH2CH3); 1.61 (1H, m, 3-CHH); 1.85 (1H, m, 3-CHH); 2.74 (1H, m, 2-CH); 2.81 (1H, dd, 5-CHH); 3.08 (1H, dd, 5-CHH); 3.36 (1H, m, 4-CH); 3.95 (2H, q, CH2CH3); 7.31 (1H, m, aromatic); 7.35 (2H, m, aromatic); 7.43 (2H, m, aromatic); 7.62 (4H, m, aromatic); 8.30 (3H, s, NH3+). m/z 312 (MN+, 100%)

Workup

  1. concentrationThe mixture was concentrated to dryness
  2. filtrationThe precipitate was collected by filtration

Sources & evidence

ORD record
ord-104aa71ef7ae4f3189f1b086c3d64211
Source dataset
uspto-grants-2012_02
Patent number
US08115016B2

Reaction notes

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