Hydrochloric Acid → (S)-4-methyl-2-[4-(naphthalen-1-yloxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-pentanoic acid

HRID 19075Notes

Reaction equation

HRID 19075 reaction equation
C[O:2][C:3](=[O:26])[C@@H:4]([N:9]1[CH2:13][C:12]([O:14][C:15]2[C:24]3[C:19](=[CH:20][CH:21]=[CH:22][CH:23]=3)[CH:18]=[CH:17][CH:16]=2)=[CH:11][C:10]1=[O:25])[CH2:5][CH:6]([CH3:8])[CH3:7].O.[OH-].[Li+].Cl>O1CCCC1.O>[CH3:7][CH:6]([CH3:8])[CH2:5][C@H:4]([N:9]1[CH2:13][C:12]([O:14][C:15]2[C:24]3[C:19](=[CH:20][CH:21]=[CH:22][CH:23]=3)[CH:18]=[CH:17][CH:16]=2)=[CH:11][C:10]1=[O:25])[C:3]([OH:26])=[O:2]

Participants

6

Reactant 3

HCID 313Hydrochloric AcidHCID 168937Lithium hydroxide, monohydrateHCID 66894649(S)-4-methyl-2-[4-(naphthalen-1-yloxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-pentanoic acid methyl ester

Product 1

HCID 66894352(S)-4-methyl-2-[4-(naphthalen-1-yloxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-pentanoic acidYield 100.9%

Reagents, catalysts & solvents 2

HCID 962WaterSolvent2×HCID 8028TetrahydrofuranSolvent

Conditions

Temperature
25 °C

Procedure

A mixture of (S)-4-methyl-2-[4-(naphthalen-1-yloxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-pentanoic acid methyl ester (0.38 g, 1.08 mmol) in tetrahydrofuran (8.1 mL) and water (2.7 mL) was treated with lithium hydroxide monohydrate (54 mg, 1.3 mmol). The reaction was stirred at 25° C. for 2 h. At this time, the reaction was diluted with water (50 mL), acidified with a 2N aqueous hydrochloric acid solution and then extracted with 10% methanol/dichloromethane (3×50 mL). The combined organics were dried over sodium sulfate, filtered and concentrated in vacuo to afford (S)-4-methyl-2-[4-(naphthalen-1-yloxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-pentanoic acid (0.37 g, 99%) as a pale yellow solid: HR-ES-MS m/z calculated for C20H21NO4 [M+H]+ 340.1544, observed 340.1545; The material was used without further purification. 1H NMR (300 MHz, DMSO-d6) δ ppm 0.88 (d, J=6.3 Hz, 3H), 0.95 (d, J=6.3 Hz, 3H), 1.43-1.88 (m, 3H), 4.33 (d, J=18.1 Hz, 1H), 4.42 (d, J=18.1 Hz, 1H), 4.64 (dd, J=11.3, 4.4 Hz, 1H), 4.74 (s, 1H), 7.51 (d, J=7.5 Hz, 1H), 7.54-7.68 (m, 3H), 7.91 (d, J=8.2 Hz, 1H), 7.96-8.09 (m, 2H), 12.89 (br. s., 1H).

Workup

  1. extractionextracted with 10% methanol/dichloromethane (3×50 mL)
  2. dry with materialThe combined organics were dried over sodium sulfate
  3. filtrationfiltered
  4. concentrationconcentrated in vacuo

Sources & evidence

ORD record
ord-ff20aad6d48649bd8ceb7e79336e45e4
Source dataset
uspto-grants-2010_06
Patent number
US07741327B2

Reaction notes

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