Potassium Phosphate, Tribasic → 1,1-dimethylethyl 7-{4-[(methyloxy)carbonyl]phenyl}-2,3-dihydro-1,4-benzoxazepine-4(5H)-carboxylate

HRID 241184Notes

Reaction equation

HRID 241184 reaction equation
[CH3:1][O:2][C:3]([C:5]1[CH:10]=[CH:9][C:8](B(O)O)=[CH:7][CH:6]=1)=[O:4].Br[C:15]1[CH:16]=[CH:17][C:18]2[O:24][CH2:23][CH2:22][N:21]([C:25]([O:27][C:28]([CH3:31])([CH3:30])[CH3:29])=[O:26])[CH2:20][C:19]=2[CH:32]=1.P([O-])([O-])([O-])=O.[K+].[K+].[K+]>O1CCOCC1.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.Cl[Pd]Cl.[Fe+2]>[CH3:1][O:2][C:3]([C:5]1[CH:10]=[CH:9][C:8]([C:15]2[CH:16]=[CH:17][C:18]3[O:24][CH2:23][CH2:22][N:21]([C:25]([O:27][C:28]([CH3:30])([CH3:29])[CH3:31])=[O:26])[CH2:20][C:19]=3[CH:32]=2)=[CH:7][CH:6]=1)=[O:4]

Participants

6

Reactant 3

HCID 62657Potassium Phosphate, TribasicHCID 27343694-Methoxycarbonylphenylboronic acidHCID 25220760tert-Butyl 7-bromo-2,3-dihydro-1,4-benzoxazepine-4(5H)-carboxylate

Product 1

HCID 668201301,1-dimethylethyl 7-{4-[(methyloxy)carbonyl]phenyl}-2,3-dihydro-1,4-benzoxazepine-4(5H)-carboxylateYield 61.3%

Reagents, catalysts & solvents 2

HCID 178418228Bis(cyclopenta-1,4-dien-1-yl(diphenyl)phosphane);dichloropalladium;iron(2+)CatalystHCID 312751,4-DioxaneSolvent

Procedure

A suspension of {4-[(methyloxy)carbonyl]phenyl}boronic acid (0.36 g, 2.0 mmol), 1,1-dimethylethyl 7-bromo-2,3-dihydro-1,4-benzoxazepine-4(5H)-carboxylate (0.66 g, 2.0 mmol), [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium(II) (70.0 mg, 0.10 mmol), and tripotassium phosphate (1.30 g, 12.0 mmol) in dioxane (20 mL) was refluxed for 3 h, and then cooled to room temperature. The reaction mixture was partitioned between ethyl acetate (50 mL) and water (80 mL), the organic layer was washed with brine (40 mL), dried over sodium sulfate then filtered and concentrated. Column chromatography on silica (ethyl acetate:hexanes 1:4) gave 1,1-dimethylethyl 7-{4-[(methyloxy)carbonyl]phenyl}-2,3-dihydro-1,4-benzoxazepine-4(5H)-carboxylate (0.47 g, 60% yield). 1H NMR (400 MHZ, DMSO-D6): 8.11 (m, 2H), 7.63-7.52 (m, 2H), 7.43 (m, 2H), 7.10 (t, 1H), 4.57-4.43 (br, 2H), 4.08 (m, 2H), 3.82 (m, 2H), 1.40 (s, 9H); MS (EI) for C22H25NO5: 469 (MH+).

Workup

  1. temperaturewas refluxed for 3 h
  2. customThe reaction mixture was partitioned between ethyl acetate (50 mL) and water (80 mL)
  3. washthe organic layer was washed with brine (40 mL)
  4. dry with materialdried over sodium sulfate
  5. filtrationthen filtered
  6. concentrationconcentrated

Sources & evidence

ORD record
ord-3aba9a92bd40493d87be03f88d361484
Source dataset
uspto-grants-2014_02
Patent number
US08648066B2

Reaction notes

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