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Tert-butoxycarbonylalanine → [(S)-1-(3-Bromo-2-cyclopropylamino-4-fluorophenylcarbamoyl)ethyl]carbamic acid tert-butyl ester

HRID 243139
Notes
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Reaction equation

HRID 243139 reaction equation
[Br:1][C:2]1[C:7]([F:8])=[CH:6][CH:5]=[C:4]([NH2:9])[C:3]=1[NH:10][CH:11]1[CH2:13][CH2:12]1.[C:14]([O:18][C:19]([NH:21][C@@H:22]([CH3:26])[C:23](O)=[O:24])=[O:20])([CH3:17])([CH3:16])[CH3:15].C1C=NC2N(O)N=NC=2C=1.CCN=C=NCCCN(C)C.Cl>C(Cl)Cl>[C:14]([O:18][C:19](=[O:20])[NH:21][C@H:22]([C:23](=[O:24])[NH:9][C:4]1[CH:5]=[CH:6][C:7]([F:8])=[C:2]([Br:1])[C:3]=1[NH:10][CH:11]1[CH2:13][CH2:12]1)[CH3:26])([CH3:15])([CH3:16])[CH3:17]
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

Participants

6

Reactant 4

HCID 85082Tert-butoxycarbonylalanineHCID 181649HOAtHCID 27239391,3-Propanediamine, N'-(ethylcarbonimidoyl)-N,N-dimethyl-, monohydrochlorideHCID 681575913-Bromo-N2-cyclopropyl-4-fluorobenzene-1,2-diamine

Product 1

HCID 68158397[(S)-1-(3-Bromo-2-cyclopropylamino-4-fluorophenylcarbamoyl)ethyl]carbamic acid tert-butyl esterYield 81.4%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Conditions

Temperature
0 °C

Procedure

A mixture of 3-bromo-N2-cyclopropyl-4-fluorobenzene-1,2-diamine (759 mg, 3.10 mmol), (S)-2-tertbutoxycarbonylaminopropionic acid (644 mg, 3.41 mmol), HOAt (464 mg, 3.41 mmol) and N-(3-dimethylaminopropyl)-N-ethylcarbodiimide hydrochloride (654 mg, 3.41 mmol) in DCM (20 mL) was stirred at 0° C. for 1 h. The reaction mixture was then partitioned between DCM and a saturated solution of NaHCO3. The organic fraction was dried and concentrated in vacuo. The resulting residue was purified by column chromatography (Si—PCC, gradient 0-50% EtOAc in cyclohexane) to afford the title compound (1.05 g, 81%) as a pale beige solid. LCMS (Method C): RT 3.66 min [M+H]+ 416.05

Workup

  1. customThe reaction mixture was then partitioned between DCM
  2. customThe organic fraction was dried
  3. concentrationconcentrated in vacuo
  4. customThe resulting residue was purified by column chromatography (Si—PCC, gradient 0-50% EtOAc in cyclohexane)

Sources & evidence

ORD record
ord-78ae5010312d45bd813dcf735c14ec4a
Source dataset
uspto-grants-2014_02
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US08653089B2

Reaction notes

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On this pageParticipantsConditionsProcedureWorkupSources & evidenceReaction notes