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

HRID 886927Notes

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.[O:20]1[CH:24]=[C:23](B2OC(C)(C)C(C)(C)O2)[CH:22]=[N:21]1.P([O-])([O-])([O-])=O.[K+].[K+].[K+].O>O1CCOCC1>[O:20]1[CH:24]=[C:23]([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:22]=[N:21]1

Participants

Conditions

Temperature: 85 °C

Procedure

A mixture of tert-butyl 9-bromo-2,3-dihydro-1,4-benzoxazepine-4(5H)-carboxylate (200 mg, 0.605 mmol), 4-isooxazolylboronic acid pinacol ester (119 mg, 0.609 mmol), tripotassium phosphate (194 mg, 0.914 mmol), and [1,1′-bis(diphenylphosphino)ferrocene]palladium(II) dichloride dichloromethane complex (24.9 mg, 0.0305 mmol) in dioxane (2 ml) was stirred at 85° C. for 12 hr under a nitrogen atmosphere. 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=2:1) to give the desired product (120 mg, 62.2%) as an oil.

Workup

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

Sources & evidence

ORD record: ord-08cfec8cf1284c1a92a64db3fd24c69b
Source dataset: uspto-grants-2012_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08247403B2

Reaction notes

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