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Succinic anhydride → (R)-4-(1-(3'-chlorobiphenyl-4-yl)-4-ethoxy-4-oxobutan-2-ylamino)-4-oxobutanoic acid

HRID 1944998
Notes
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Reaction equation

HRID 1944998 reaction equation
Cl.[NH2:2][C@H:3]([CH2:10][C:11]1[CH:16]=[CH:15][C:14]([C:17]2[CH:22]=[CH:21][CH:20]=[C:19]([Cl:23])[CH:18]=2)=[CH:13][CH:12]=1)[CH2:4][C:5]([O:7][CH2:8][CH3:9])=[O:6].[C:24]1(=[O:30])[O:29][C:27](=[O:28])[CH2:26][CH2:25]1.CCN(C(C)C)C(C)C>ClCCl>[Cl:23][C:19]1[CH:18]=[C:17]([C:14]2[CH:15]=[CH:16][C:11]([CH2:10][C@@H:3]([NH:2][C:24](=[O:30])[CH2:25][CH2:26][C:27]([OH:29])=[O:28])[CH2:4][C:5]([O:7][CH2:8][CH3:9])=[O:6])=[CH:12][CH:13]=2)[CH:22]=[CH:21][CH:20]=1
ParticipantsProcedureWorkupSources & evidenceReaction notes

Participants

5

Reactant 3

HCID 7922Succinic anhydrideHCID 81531DiisopropylethylamineHCID 86648190(R)-ethyl 3-amino-4-(3'-chlorobiphenyl-4-yl)butanoate hydrochloride

Product 1

HCID 49822224(R)-4-(1-(3'-chlorobiphenyl-4-yl)-4-ethoxy-4-oxobutan-2-ylamino)-4-oxobutanoic acidYield 54%

Reagents, catalysts & solvents 1

HCID 6344
Dichloromethane
Solvent

Procedure

A solution of (R)-ethyl 3-amino-4-(3′-chlorobiphenyl-4-yl)butanoate hydrochloride (400 mg, 1.13 mmol), succinic anhydride (136 mg, 1.36 mmol) and DIPEA (0.237 mL, 1.36 mmol) in dichloromethane (5 mL) is allowed to stir for 2.5 hours. The reaction is quenched with 1 M aqueous HCl and extracted with dichloromethane. The organic layer is separated and concentrated under reduced pressure. The resulting residue is purified by preparative HPLC using a gradient of 20% MeCN/water (0.1% TFA) to 100% MeCN to give (R)-4-(1-(3′-chlorobiphenyl-4-yl)-4-ethoxy-4-oxobutan-2-ylamino)-4-oxobutanoic acid (255 mg). HPLC retention time=1.15 minutes (condition B); MS (m+1)=418.0; 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 1.29 (t, J=7.08 Hz, 3H) 2.46-2.58 (m, 4H) 2.64-2.67 (m, 2H) 2.87 (A of ABX, Jab=13.6 Hz, Jax=7.8 Hz, 1H) 2.99 (B of ABX, Jab=13.6 Hz, Jbx=6.6 Hz, 1H) 4.12-4.24 (m, 2H) 4.47-4.55 (m, 1H) 6.50 (br d, J=8.8 Hz, 1H) 7.24-7.37 (m, 4H) 7.43-7.46 (m, 1H) 7.48-7.52 (m, 2H) 7.55-7.56 (m, 1H). Chiral HPLC retention time=3.59 min. Column: Daicel CHIRALPAK AD-H (4.6×100 mm); flow rate=1 ml/min.; eluent: EtOH (containing 0.1% TFA)/heptane=4/6.

Workup

  1. customThe reaction is quenched with 1 M aqueous HCl
  2. extractionextracted with dichloromethane
  3. customThe organic layer is separated
  4. concentrationconcentrated under reduced pressure
  5. customThe resulting residue is purified by preparative HPLC

Sources & evidence

ORD record
ord-0c485018a2b34e308e5dace6907273e6
Source dataset
uspto-grants-2013_03
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US08394853B2

Reaction notes

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On this pageParticipantsProcedureWorkupSources & evidenceReaction notes