Water → tert-butyl 9-(5-formyl-3-furyl)-2,3-dihydro-1,4-benzoxazepine-4(5H)-carboxylate

HRID 886913Notes

Reaction equation

HRID 886913 reaction equation
Br[C:2]1[C:12]2[O:11][CH2:10][CH2:9][N:8]([C:13]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])[CH2:7][C:6]=2[CH:5]=[CH:4][CH:3]=1.[CH:20]([C:22]1[O:26][CH:25]=[C:24](B2OC(C)(C)C(C)(C)O2)[CH:23]=1)=[O:21].C(=O)([O-])[O-].[Na+].[Na+].O>COCCOC.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[CH:20]([C:22]1[O:26][CH:25]=[C:24]([C:2]2[C:12]3[O:11][CH2:10][CH2:9][N:8]([C:13]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])[CH2:7][C:6]=3[CH:5]=[CH:4][CH:3]=2)[CH:23]=1)=[O:21]

Participants

7

Reactant 4

HCID 962WaterHCID 10340Sodium CarbonateHCID 35475414-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)furan-2-carbaldehydeHCID 59403519Tert-butyl 9-bromo-2,3-dihydrobenzo[F][1,4]oxazepine-4(5H)-carboxylate

Product 1

HCID 86640603tert-butyl 9-(5-formyl-3-furyl)-2,3-dihydro-1,4-benzoxazepine-4(5H)-carboxylateYield 72.8%

Reagents, catalysts & solvents 2

HCID 178418397HCID 178418397, compoundCatalystHCID 80711,2-DimethoxyethaneSolvent

Conditions

Temperature
85 °C

Procedure

A mixture of tert-butyl 9-bromo-2,3-dihydro-1,4-benzoxazepine-4(5H)-carboxylate (1.18 g, 3.60 mmol), 5-formylfuran-3-boronic acid pinacol ester (800 mg, 3.60 mmol), saturated aqueous sodium carbonate solution (15 ml), and tetrakis(triphenylphosphine)palladium(0) (118 mg, 0.102 mmol) in ethylene glycol dimethyl ether (20 ml) was stirred under a nitrogen atmosphere at 85° C. for 12 hr. The reaction mixture was poured into water, and the mixture was extracted with ethyl acetate. The extract was washed with water, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure, and the residue was purified by silica gel column chromatography (hexane:ethyl acetate=1:1) to give the desired product (900 mg, 72.6%) as an oil.

Workup

  1. extractionthe mixture was extracted with ethyl acetate
  2. washThe extract was washed with water
  3. dry with materialdried over anhydrous magnesium sulfate
  4. customThe solvent was evaporated under reduced pressure
  5. customthe residue was purified by silica gel column chromatography (hexane:ethyl acetate=1:1)

Sources & evidence

ORD record
ord-938bbdc57a644ab8af553f210c502121
Source dataset
uspto-grants-2012_08
Patent number
US08247403B2

Reaction notes

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