Ethyl Acetate → tert-butyl N-[(3S)-2-oxo-2,3,4,5-tetrahydro-1H-1,5-benzodiazepin-3-yl]carbamate

HRID 862242Notes

Reaction equation

HRID 862242 reaction equation
Cl.CN(C)CCCN=C=NCC.[C:13]([O:17][C:18]([NH:20][CH:21]([CH2:25][NH:26][C:27]1[CH:32]=[CH:31][CH:30]=[CH:29][C:28]=1[NH2:33])[C:22](O)=[O:23])=[O:19])([CH3:16])([CH3:15])[CH3:14].C(OCC)(=O)C>CN(C)C=O>[C:13]([O:17][C:18]([NH:20][C@@H:21]1[C:22](=[O:23])[NH:33][C:28]2[CH:29]=[CH:30][CH:31]=[CH:32][C:27]=2[NH:26][CH2:25]1)=[O:19])([CH3:16])([CH3:15])[CH3:14]

Participants

5

Reactant 3

HCID 8857Ethyl AcetateHCID 27239391,3-Propanediamine, N'-(ethylcarbonimidoyl)-N,N-dimethyl-, monohydrochlorideHCID 22243668HCID 22243668, compound

Product 1

HCID 22881971tert-butyl N-[(3S)-2-oxo-2,3,4,5-tetrahydro-1H-1,5-benzodiazepin-3-yl]carbamateYield 71.2%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

1-(3-Dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (8.54 g, 44.5 mmol) was added to a cooled (0° C.) solution of 2-tert-butoxycarbonylamino-3-(2-aminophenylamino)propionic acid (11.95 g, 40.5 mmol) in 100 ml of dimethylformamide and stirred for 18 hours. The reaction was poured into 700 ml of ethyl acetate and washed four times with 100 ml of water. The organic layer was dried over anhydrous sodium sulfate, filtered, and evaporated to give a brown solid that was purified by flash chromatography eluting with 3:7 ethyl acetate/hexane to give 8 g (71%) of the title compound: 1H NMR (CDCl3) δ 7.78 (1H, s), 7.02-6.95 (1H, m), 6.88-6.82 (1H, m), 6.82-6.78 (1H, m), 6.75-6.70 (1H, m), 5.8-5.7 (1H, d), 4.55-4.45 (1H, m), 3.95 (1H, s), 3.9-3.82 (1H, m), 3.48-3.40 (1H,m), 1.45 (9H, s).

Workup

  1. washwashed four times with 100 ml of water
  2. dry with materialThe organic layer was dried over anhydrous sodium sulfate
  3. filtrationfiltered
  4. customevaporated
  5. customto give a brown solid that
  6. customwas purified by flash chromatography
  7. washeluting with 3:7 ethyl acetate/hexane

Sources & evidence

ORD record
ord-34f21be6443a4af38b49468c42032315
Source dataset
uspto-grants-1998_02
Patent number
US05716929

Reaction notes

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