tert-butyl 3(RS)-[5-(1-benzyloxycarbonyl-4-piperidyl)-1(RS)-ethoxycarbonylpentyl]amino-2-oxo-2,3,4,5-tetrahydro-1H-1-benzazepine-1-acetate → 3(RS)-[5-(4-piperidinyl)-1(RS)-ethoxycarbonylpentyl]amino-2-oxo-2,3,4,5-tetrahydro-1H-1-benzazepine-1-acetic acid.hydrobromide

HRID 1031818Notes

Reaction equation

HRID 1031818 reaction equation
C(OC([N:11]1[CH2:16][CH2:15][CH:14]([CH2:17][CH2:18][CH2:19][CH2:20][CH:21]([NH:27][CH:28]2[CH2:34][CH2:33][C:32]3[CH:35]=[CH:36][CH:37]=[CH:38][C:31]=3[N:30]([CH2:39][C:40]([O:42]C(C)(C)C)=[O:41])[C:29]2=[O:47])[C:22]([O:24][CH2:25][CH3:26])=[O:23])[CH2:13][CH2:12]1)=O)C1C=CC=CC=1.[BrH:48].C(O)(=O)C>C(O)(=O)C.C(OCC)C>[BrH:48].[NH:11]1[CH2:12][CH2:13][CH:14]([CH2:17][CH2:18][CH2:19][CH2:20][CH:21]([NH:27][CH:28]2[CH2:34][CH2:33][C:32]3[CH:35]=[CH:36][CH:37]=[CH:38][C:31]=3[N:30]([CH2:39][C:40]([OH:42])=[O:41])[C:29]2=[O:47])[C:22]([O:24][CH2:25][CH3:26])=[O:23])[CH2:15][CH2:16]1

Participants

5

Reactant 2

HCID 14407252tert-butyl 3(RS)-[5-(1-benzyloxycarbonyl-4-piperidyl)-1(RS)-ethoxycarbonylpentyl]amino-2-oxo-2,3,4,5-tetrahydro-1H-1-benzazepine-1-acetateHCID 21893785Acetic Acid Mixture with Hydrobromic Acid

Product 1

HCID 221684123(RS)-[5-(4-piperidinyl)-1(RS)-ethoxycarbonylpentyl]amino-2-oxo-2,3,4,5-tetrahydro-1H-1-benzazepine-1-acetic acid.hydrobromide

Reagents, catalysts & solvents 2

HCID 176Acetic AcidSolventHCID 3283Diethyl EtherSolvent

Procedure

In 2 ml of acetic acid is dissolved 0.8 g of tert-butyl 3(RS)-[5-(1-benzyloxycarbonyl-4-piperidyl)-1(SR)-ethoxycarbonylpentyl]amino-2-oxo-2,3,4,5-tetrahydro-1H-1-benzazepine-1-acetate, and 2 ml of 30% aqueous hydrogen bromide-acetic acid solution is added to the solution, followed by standing at room temperature for 2 hours. The reaction solution is diluted with 200 ml of ethyl ether, and after the mixture is allowed to stand, the supernatant layer is removed by decantation. The precipitate is rinsed with 100 ml of ethyl ether and dried to give 3(RS)-[5-(4-piperidyl)-1(SR)-ethoxycarbonylpentyl]amino-2-oxo-2,3,4,5-tetrahydro-1H-1-benzazepine-1-acetic acid.hydrobromide. This product is dissolved in 20 ml of 1N aqueous sodium hydroxide and the solution is allowed to stand at room temperature for 1 hour, acidified with 2 ml of acetic acid and purified by XAD-2 column chromatography (methanol:water=1:1). The effluent is concentrated under reduced pressure, and the crystals, which separate out, are rinsed with 50 ml of acetone and collected by filtration to give 0.33 g of 3(RS)-[5-(4-piperidyl)-1(SR)-carboxypentyl]amino-2-oxo-2,3,4,5-tetrahydro-1H-benzazepine-1-acetic acid as colorless prisms. m.p. 250°-260° C. (decomp.).

Workup

  1. additionis added to the solution
  2. customthe supernatant layer is removed by decantation
  3. washThe precipitate is rinsed with 100 ml of ethyl ether
  4. customdried

Sources & evidence

ORD record
ord-3a5bd3e8d2e04368af57d60fbe548d31
Source dataset
uspto-grants-1990_09
Patent number
US04954625

Reaction notes

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