Pyridine → (S)-3-[(S)-2-(4-Acetoxy-phenyl)-2,3-dihydro-benzo[1,4]dioxin-6-yl]-2-tert-butoxycarbonylamino-propionic acid methyl ester

HRID 879695Notes

Reaction equation

HRID 879695 reaction equation
[CH3:1][O:2][C:3](=[O:31])[C@@H:4]([NH:23][C:24]([O:26][C:27]([CH3:30])([CH3:29])[CH3:28])=[O:25])[CH2:5][C:6]1[CH:22]=[CH:21][C:9]2[O:10][C@@H:11]([C:14]3[CH:19]=[CH:18][C:17]([OH:20])=[CH:16][CH:15]=3)[CH2:12][O:13][C:8]=2[CH:7]=1.N1C=CC=CC=1.[C:38](OC(=O)C)(=[O:40])[CH3:39]>C(Cl)Cl>[CH3:1][O:2][C:3](=[O:31])[C@@H:4]([NH:23][C:24]([O:26][C:27]([CH3:28])([CH3:30])[CH3:29])=[O:25])[CH2:5][C:6]1[CH:22]=[CH:21][C:9]2[O:10][C@@H:11]([C:14]3[CH:19]=[CH:18][C:17]([O:20][C:38](=[O:40])[CH3:39])=[CH:16][CH:15]=3)[CH2:12][O:13][C:8]=2[CH:7]=1

Participants

5

Reactant 3

HCID 1049PyridineHCID 7918Acetic AnhydrideHCID 58327426(S)-2-tert-Butoxycarbonylamino-3-[(S)-2-(4-hydroxy-phenyl)-2,3-dihydro-benzo[1,4]dioxin-6-yl]-propionic acid methyl ester

Product 1

HCID 58327221(S)-3-[(S)-2-(4-Acetoxy-phenyl)-2,3-dihydro-benzo[1,4]dioxin-6-yl]-2-tert-butoxycarbonylamino-propionic acid methyl ester

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Procedure

To a solution of (S)-2-tert-Butoxycarbonylamino-3-[(S)-2-(4-hydroxy-phenyl)-2,3-dihydro-benzo[1,4]dioxin-6-yl]-propionic acid methyl ester (240 mg) in DCM (10 mL) was added pyridine at 0° C. To this mixture was added acetic anhydride. The mixture was stirred for 2-3 h. After completion of the reaction, the mixture was diluted with DCM (50 mL) and was washed with water, 1N HCl and brine solution. The organic layer was dried and concentrated to get the desired product as a white solid (208 mg). LCMS (m/z): 473

Workup

  1. customAfter completion of the reaction
  2. washwas washed with water, 1N HCl and brine solution
  3. customThe organic layer was dried
  4. concentrationconcentrated

Sources & evidence

ORD record
ord-99fd758b118346c3942ec9a2ed6cec0e
Source dataset
uspto-grants-2015_03
Patent number
US08987295B2

Reaction notes

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