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4-Methylmorpholine → tert-butyl N-[(benzyloxy)carbonyl]glycyl-D-valinate

HRID 254072
Notes
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Reaction equation

HRID 254072 reaction equation
[CH2:1]([O:8][C:9]([NH:11][CH2:12][C:13]([OH:15])=O)=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.Cl.[NH2:17][C@@H:18]([C:22]([O:24][C:25]([CH3:28])([CH3:27])[CH3:26])=[O:23])[CH:19]([CH3:21])[CH3:20].CN1CCOCC1.CN(C(ON1N=NC2C=CC=CC1=2)=[N+](C)C)C.[B-](F)(F)(F)F>C(Cl)Cl>[CH2:1]([O:8][C:9]([NH:11][CH2:12][C:13]([NH:17][C@@H:18]([C:22]([O:24][C:25]([CH3:27])([CH3:26])[CH3:28])=[O:23])[CH:19]([CH3:21])[CH3:20])=[O:15])=[O:10])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1
ParticipantsProcedureWorkupSources & evidenceReaction notes

Participants

6

Reactant 4

HCID 79724-MethylmorpholineHCID 14349BenzyloxycarbonylglycineHCID 2733207O-(Benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborateHCID 45108216H-D-Val-OtBu hydrochloride

Product 1

HCID 66843039tert-butyl N-[(benzyloxy)carbonyl]glycyl-D-valinateYield 94.4%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

A mixture of N-[(benzyloxy)carbonyl]glycine (, 2.4 g, 11.5 mmol), tert-butyl D-valinate hydrochloride (2.4 g, 11.4 mmol) and N-methylmorpholine (2.53 ml, 22.9 mmol) in DCM (20 ml) was stirred at room temperature. TBTU (4.79 g, 14.9 mmol) was added and the mixture was stirred for three days. The solvent was removed under reduced pressure. Water was added and the mixture was extracted two times with toluen. The organic layer was washed with brine, dried (Na2SO4), filtered and concentrated. The crude product was purified by flash chromatography using DCM:EtOAc:aceton 4:1:1 as eluent to give 3.92 g (94%) of the title compound. NMR (500 MHz, CD3COOD) 0.88-0.99 (m, 6H), 1.48 (s, 9H), 2.08-2.19 (m 1H), 3.85 (ABq, 2H), 4.24 (d, 1H), 5.12 (ABq, 2H), 7.28-7.41 (m, 5H).

Workup

  1. stirringthe mixture was stirred for three days
  2. customThe solvent was removed under reduced pressure
  3. additionWater was added
  4. extractionthe mixture was extracted two times with toluen
  5. washThe organic layer was washed with brine
  6. dry with materialdried (Na2SO4)
  7. filtrationfiltered
  8. concentrationconcentrated
  9. customThe crude product was purified by flash chromatography

Sources & evidence

ORD record
ord-c814377aca664cdea24e72fa1be9570a
Source dataset
uspto-grants-2011_01
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US07871998B2

Reaction notes

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On this pageParticipantsProcedureWorkupSources & evidenceReaction notes