Ethylmorpholine → 4-((S)-2-Benzyloxycarbonylamino-4-tert-butoxycarbonyl-butyryl)-piperazine-1-carboxylic acid cyclobutyl ester

HRID 1185500Notes

Reaction equation

HRID 1185500 reaction equation
[C:1]([O:5][C:6](=[O:24])[CH2:7][CH2:8][C@H:9]([NH:13][C:14]([O:16][CH2:17][C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1)=[O:15])[C:10]([OH:12])=O)([CH3:4])([CH3:3])[CH3:2].[CH:25]1([O:29][C:30]([N:32]2[CH2:37][CH2:36][NH:35][CH2:34][CH2:33]2)=[O:31])[CH2:28][CH2:27][CH2:26]1.C(N1CCOCC1)C.[B-](F)(F)(F)F.CCOC(C(C#N)=NOC(N(C)C)=[N+](C)C)=O>CN(C=O)C.C(OCC)(=O)C>[CH:25]1([O:29][C:30]([N:32]2[CH2:37][CH2:36][N:35]([C:10](=[O:12])[C@@H:9]([NH:13][C:14]([O:16][CH2:17][C:18]3[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=3)=[O:15])[CH2:8][CH2:7][C:6]([O:5][C:1]([CH3:2])([CH3:3])[CH3:4])=[O:24])[CH2:34][CH2:33]2)=[O:31])[CH2:28][CH2:27][CH2:26]1

Participants

7

Reactant 4

HCID 7525EthylmorpholineHCID 1074725-tert-Butyl N-((phenylmethoxy)carbonyl)-L-glutamateHCID 2733286O-[(Ethoxycarbonyl)cyanomethylenamino]-N,N,N',N'-tetramethyluronium tetrafluoroborateHCID 668544701-Cyclobutoxycarbonylpiperazine

Product 1

HCID 668557484-((S)-2-Benzyloxycarbonylamino-4-tert-butoxycarbonyl-butyryl)-piperazine-1-carboxylic acid cyclobutyl ester

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 8857Ethyl AcetateSolvent

Procedure

To a solution of 6.0 g (S)-2-Benzyloxycarbonylamino-pentanedioic acid 5-tert-butyl ester in 50 ml DMF were added 3.3 g piperazine-1-carboxylic acid cyclobutyl ester, 9.1 ml N-ethylmorpholine and 5.9 g TOTU. After stirring for 12 h the solution was diluted with ethyl acetate and subsequently washed with aqueous LiCl (4%) and saturated aqueous NaHCO3. The crude product obtained after evaporation of the solvent was used without further purification. Yield: 11.1 g.

Workup

  1. washsubsequently washed with aqueous LiCl (4%) and saturated aqueous NaHCO3

Sources & evidence

ORD record
ord-cef6c2f5a7714aacae18cc7d23470724
Source dataset
uspto-grants-2014_03
Patent number
US08669266B2

Reaction notes

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