Ethanol → LBQ-657

HRID 1641660Notes

Reaction equation

HRID 1641660 reaction equation
C([O:3][C:4](=[O:29])[C@H:5]([CH3:28])[CH2:6][C@H:7]([N:21]1[C:25](=[O:26])[CH2:24][CH2:23][C:22]1=[O:27])[CH2:8][C:9]1[CH:14]=[CH:13][C:12]([C:15]2[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=2)=[CH:11][CH:10]=1)C.[OH-].[Na+].C1C[O:35]CC1.C(O)C>O>[C:12]1([C:15]2[CH:16]=[CH:17][CH:18]=[CH:19][CH:20]=2)[CH:13]=[CH:14][C:9]([CH2:8][C@@H:7]([NH:21][C:25](=[O:26])[CH2:24][CH2:23][C:22]([OH:27])=[O:35])[CH2:6][C@@H:5]([CH3:28])[C:4]([OH:3])=[O:29])=[CH:10][CH:11]=1

Participants

6

Reactant 4

HCID 702EthanolHCID 8028TetrahydrofuranHCID 14798Sodium HydroxideHCID 66739220Ethyl (2R,4S)-4-([1,1'-biphenyl]-4-ylmethyl)-2-methyl-4-(2,5-dioxopyrrolidin-1-yl)butanoate

Product 1

HCID 10430040LBQ-657

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

(2R,4S)-5-Biphenyl-4-yl-4-(2,5-dioxopyrrolidin-1-yl)-2-methylpentanoic acid ethyl ester (590 mg) is added to a mixture of 1 M NaOH (2.75 ml), THF (9 ml) and ethanol (9 ml). The mixture is stirred for 16 h. The mixture is diluted with water (20 ml) and extracted with isopropyl acetate. The water phase is acidified with 1 M HCl (5 ml) and extracted with isopropyl acetate. The combined organic phases are dried (MgSO4) and concentrated in vacuo to give (2R,4S)-5-Biphenyl-4-yl-4-(3-carboxypropionylamino)-2-methyl-pentanoic acid (3-a, R1=4-oxo-pentanoic acid, R2=H, R3=H). 1H NMR (DMSO): 1.05 (2H), 1.35 (1H), 1.79 (1H), 2.29 (2H), 2.39 (3H), 2.70 (2H), 3.97 (1H), 7.25 (2H), 7.34 (1H), 7.44 (2H), 7.56 (2H), 7.63 (2H), 7.74 (1H), 12.01 (2H).

Workup

  1. extractionextracted with isopropyl acetate
  2. extractionextracted with isopropyl acetate
  3. dry with materialThe combined organic phases are dried (MgSO4)
  4. concentrationconcentrated in vacuo

Sources & evidence

ORD record
ord-c69fbd64abc948e4a810db0f3b4e04fc
Source dataset
uspto-grants-2012_02
Patent number
US08115016B2

Reaction notes

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