Potassium Carbonate → 2-(4,4-Dimethyl-2-oxo-1,4-dihydro-2H-benzo[d][1,3]oxazin-6-yl)-pyrrole-1-carboxylic acid tert-butyl ester

HRID 1634980Notes

Reaction equation

HRID 1634980 reaction equation
Br[C:2]1[CH:14]=[CH:13][C:5]2[NH:6][C:7](=[O:12])[O:8][C:9]([CH3:11])([CH3:10])[C:4]=2[CH:3]=1.[C:15]([O:19][C:20]([N:22]1[CH:26]=[CH:25][CH:24]=[C:23]1B(O)O)=[O:21])([CH3:18])([CH3:17])[CH3:16].C(=O)([O-])[O-].[K+].[K+].C(=O)(O)[O-].[Na+]>C1(C)C=CC=CC=1.C(O)C.O.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>[C:15]([O:19][C:20]([N:22]1[CH:26]=[CH:25][CH:24]=[C:23]1[C:2]1[CH:14]=[CH:13][C:5]2[NH:6][C:7](=[O:12])[O:8][C:9]([CH3:11])([CH3:10])[C:4]=2[CH:3]=1)=[O:21])([CH3:18])([CH3:16])[CH3:17]

Participants

9

Reactant 4

HCID 11430Potassium CarbonateHCID 30630BrofoxineHCID 516892Sodium BicarbonateHCID 27343211-(tert-Butoxycarbonyl)-2-pyrroleboronic Acid

Product 1

HCID 114392892-(4,4-Dimethyl-2-oxo-1,4-dihydro-2H-benzo[d][1,3]oxazin-6-yl)-pyrrole-1-carboxylic acid tert-butyl esterYield 62%

Reagents, catalysts & solvents 4

HCID 178418397HCID 178418397, compoundCatalystHCID 702EthanolSolventHCID 962WaterSolventHCID 1140TolueneSolvent

Conditions

Temperature
80 °C

Procedure

A solution of 6-bromo-4,4-dimethyl-1,4-dihydro-benzo[d][1,3]oxazin-2-one (0.87 g, 3.4 mmol) and tetrakis(triphenylphosphine)palladium(0) (96 mg, 0.08 mmol) in toluene (40 mL) was stirred under a flow of nitrogen for 25 min. To the solution was added sequentially 1-t-butoxycarbonylpyrrole-2-boronic acid (1.4 g, 7.0 mmol) in absolute ethanol (10 mL) and potassium carbonate (0.94 g, 7.0 mmol) in water (10 mL). The mixture was heated at 80° C. for 16 h and allowed to cool to rt. The reaction mixture was poured into aqueous saturated sodium bicarbonate solution (100 mL) and extracted with ethyl acetate (3×100 mL). The organic layers were combined, washed with water (100 mL) and brine (50 mL) and dried over magnesium sulfate. The solution was filtered, concentrated in vacuo, and the residue was purified by flash column chromatography on silica gel (30% ethyl acetate/hexane) to give the title compound as an off-white powder (0.7 g, 62%): mp 176° C. 1H NMR (CDCl3) δ1.40 (s, 9H), 1.73 (s, 6H), 6.17 (dd, 1H, J=1.8, 3.3 Hz), 6.22 (dd, 1H, J=3.3, 3.3 Hz), 6.77 (d, 1H, J=8.1 Hz), 7.13 (d, 1H, J=1.8 Hz), 7.23 (dd, 1H, J=1.8, 8.1 Hz), 7.33 (dd, 1H, J=1.8, 3.3 Hz), 7.69 (bs, 1H). MS ((−) ESI) m/z 341 [M−H]−. Anal. Calcd for C19H22N2O4: C, 66.65; H, 6.48; N, 8.18. Found: C, 65.46; H, 6.51; N, 7.74.

Workup

  1. temperatureto cool to rt
  2. extractionextracted with ethyl acetate (3×100 mL)
  3. washwashed with water (100 mL) and brine (50 mL)
  4. dry with materialdried over magnesium sulfate
  5. filtrationThe solution was filtered
  6. concentrationconcentrated in vacuo
  7. customthe residue was purified by flash column chromatography on silica gel (30% ethyl acetate/hexane)

Sources & evidence

ORD record
ord-d537a2e56ea843caad2bd0eb41c396e8
Source dataset
uspto-grants-2003_01
Patent number
US06509334B1

Reaction notes

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