Trifluoroacetic acid → 3(R)-amino-N-(l(S)-benzyl-2-hydroxyethyl)succinamic acid benzyl ester trifluoroacetate salt
Reaction equation
[CH2:1]([O:8][C:9](=[O:33])[CH2:10][C@@H:11]([NH:25]C(OC(C)(C)C)=O)[C:12]([NH:14][C@@H:15]([CH2:18][C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1)[CH2:16][OH:17])=[O:13])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[F:34][C:35]([F:40])([F:39])[C:36]([OH:38])=[O:37]>C(Cl)Cl>[F:34][C:35]([F:40])([F:39])[C:36]([OH:38])=[O:37].[CH2:1]([O:8][C:9](=[O:33])[CH2:10][C@@H:11]([NH2:25])[C:12]([NH:14][C@@H:15]([CH2:18][C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1)[CH2:16][OH:17])=[O:13])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1Participants
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Procedure
To a solution of N-(1(S)-benzyl-2-hydroxyethyl)-3 (R)-(t-butoxycarbonylamino) succinamic acid benzyl ester (389 mg, 0.851 mmol) in CH2Cl2 (5 mL) was added trifluoroacetic acid (1 mL). After 2.5 h at ambient temperature, the solvent was removed in vacuo to give 3(R)-amino-N-(1(S)-benzyl-2-hydroxyethyl)succinamic acid benzyl ester trifluoroacetate salt as a yellow foam that was placed with 3-(biphenyl-4-yl-)2,5-dimethoxytetrahydrofuran (182 mg, 0.641 mmol) in HOAc (1 mL) and heated to 50° C. After 2 hours, the mixture was allowed to cool, carefully stirred with saturated aqueous NaHCO3 (25 mL), and extracted into CHCl3 (3×15 mL). The combined organic layers were dried over Na2SO4 and evaporated to give a brown oil, 685 mg. Flash column chromatography with 10% MeOH/CH2Cl2 as eluant provided 276 mg (64%) of N-(1(S)-benzyl-2-hydroxyethyl)-3(R)-(3-(biphenyl-4-yl)-1H-pyrrol-1-yl)succinamic acid benzyl ester as a yellow solid.
Workup
- customthe solvent was removed in vacuo
Sources & evidence
- ORD record
- ord-7f65bfbbb58f449489aabeae31b3e2e0
- Source dataset
- uspto-grants-2001_10
- Patent number
- US06306892B1
Reaction notes
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