Hydrochloric Acid → 1-{N-[(methyloxy)carbonyl]-L-valyl}-8-oxa-1-azaspiro[4.5]decane-2-carboxylic acid

HRID 1800801Notes

Reaction equation

HRID 1800801 reaction equation
[CH3:1][O:2][C:3]([NH:5][C@H:6]([C:10]([N:12]1[C:16]2([CH2:21][CH2:20][O:19][CH2:18][CH2:17]2)[CH2:15][CH2:14][CH:13]1[C:22]([O:24]CC)=[O:23])=[O:11])[CH:7]([CH3:9])[CH3:8])=[O:4].O.[OH-].[Li+].Cl>C1COCC1.O.CO>[CH3:1][O:2][C:3]([NH:5][C@H:6]([C:10]([N:12]1[C:16]2([CH2:17][CH2:18][O:19][CH2:20][CH2:21]2)[CH2:15][CH2:14][CH:13]1[C:22]([OH:24])=[O:23])=[O:11])[CH:7]([CH3:9])[CH3:8])=[O:4]

Participants

5

Reactant 3

HCID 313Hydrochloric AcidHCID 168937Lithium hydroxide, monohydrateHCID 58313069ethyl 1-{N-[(methyloxy)carbonyl]-L-valyl}-8-oxa-1-azaspiro[4.5]decane-2-carboxylate

Product 1

HCID 583130871-{N-[(methyloxy)carbonyl]-L-valyl}-8-oxa-1-azaspiro[4.5]decane-2-carboxylic acidYield 77.4%

Reagents, catalysts & solvents 1

HCID 21892291Methanol tetrahydrofuran waterSolvent

Procedure

To a solution of ethyl 1-{N-[(methyloxy)carbonyl]-L-valyl}-8-oxa-1-azaspiro[4.5]decane-2-carboxylate (167) (80 mg, 0.2 mmol) in THF/water/methanol (1.0 mL/0.5 mL/0.5 mL) was added lithium hydroxide monohydrate (13 mg, 0.3 mmol) and the reaction stirred at room temperature for 72 h. The reaction was treated with 1N HCl (0.5 mL) and the reaction partitioned between EtOAc and 0.1 N HCl. The organic layer was separated and dried over MgSO4 and concentrated in vacuo to afford the title compound as a white solid (53 mg, 72% yield). 1H NMR (400 MHz, DMSO-d6) δ ppm 12.88 (br. s., 1H) 7.45-7.61 (m, 1H) 4.89-5.03 (m, 1H) 3.70-3.87 (m, 2H) 3.65 (t, J=9.2 Hz, 1H) 3.53 (s, 3H) 3.02 (td, J=12.9, 4.9 Hz, 1H) 2.71-2.90 (m, 1H) 2.22-2.38 (m, 1H) 1.87-2.19 (m, 3H) 1.53-1.73 (m, 1H) 1.32-1.42 (m, 1H) 1.06-1.15 (m, 1H) 0.61-0.98 (m, 8H). LC-MS ESI (M+H)+=342.95.

Workup

  1. customthe reaction partitioned between EtOAc and 0.1 N HCl
  2. customThe organic layer was separated
  3. dry with materialdried over MgSO4
  4. concentrationconcentrated in vacuo

Sources & evidence

ORD record
ord-5344c6b52b6a478799a778bc929b5919
Source dataset
uspto-grants-2013_01
Patent number
US08344155B2

Reaction notes

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