2-(Tributylstannyl)-1,3-thiazole → 4,4-Dimethyl-6-(3-thiazol-2-yl-phenyl)1,4-dihydro-benzo[d][1,3]oxazin-2-one

HRID 1278677Notes

Reaction equation

HRID 1278677 reaction equation
Br[C:2]1[CH:3]=[C:4]([C:8]2[CH:20]=[CH:19][C:11]3[NH:12][C:13](=[O:18])[O:14][C:15]([CH3:17])([CH3:16])[C:10]=3[CH:9]=2)[CH:5]=[CH:6][CH:7]=1.C([Sn](CCCC)(CCCC)[C:26]1[S:27][CH:28]=[CH:29][N:30]=1)CCC>CN(C=O)C>[CH3:16][C:15]1([CH3:17])[O:14][C:13](=[O:18])[NH:12][C:11]2[CH:19]=[CH:20][C:8]([C:4]3[CH:5]=[CH:6][CH:7]=[C:2]([C:26]4[S:27][CH:28]=[CH:29][N:30]=4)[CH:3]=3)=[CH:9][C:10]1=2

Participants

4

Reactant 2

HCID 27632592-(Tributylstannyl)-1,3-thiazoleHCID 98624116-(3-Bromo-phenyl)-4,4-dimethyl-1,4-dihydro-benzo[d][1,3]oxazin-2-one

Product 1

HCID 98589994,4-Dimethyl-6-(3-thiazol-2-yl-phenyl)1,4-dihydro-benzo[d][1,3]oxazin-2-oneYield 23.8%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Conditions

Temperature
90 °C

Procedure

A mixture of 6-(3-bromo-phenyl)-4,4-dimethyl-1,4-dihydro-benzo[d][1,3]oxazin-2-one (0.25 g, 0.75 mmol), tri-n-butyl-thiazol-2-yl tin (0.5 g, 1.3 mmol) in DMF (5 mL) was degassed to remove oxygen and then heated under nitrogen at 90° C. for 3 hours. The reaction mixture was cooled to room temperature (rt) and treated with ice-water (70 mL). Ethyl acetate (100 mL) was added and organic layer was separated, washed with brine, and dried (MgSO4). After removal of solvent, the residue was purified by a silica gel column (hexane:ethyl acetate/1:1) to give the title compound as a white solid (60 mg, 23%): mp 223-224° C.; 1H-NMR (DMSO-d6) δ10.4 (s, 1H), 9.13 (s, 1H), 8.45 (s, 1H), 7.94 (bs, 1H), 7.67-7.61 (m, 4H), 7.53 (t, 1H, J=7.68 Hz), 7.00 (d, 1H, J=8.81 Hz), 1.7 (s, 6H); MS (APCI) m/z 337([M+H]+, 100%); Anal. Calc. For C19H16N2O2S.0.25 H2O: C, 66.94, H, 4.88, N, 8.22. Found: C, 66.57, H, 4.65, N, 7.92.

Workup

  1. customwas degassed
  2. customto remove oxygen
  3. temperatureThe reaction mixture was cooled to room temperature (rt)
  4. additiontreated with ice-water (70 mL)
  5. additionEthyl acetate (100 mL) was added
  6. customorganic layer was separated
  7. washwashed with brine
  8. dry with materialdried (MgSO4)
  9. customAfter removal of solvent
  10. customthe residue was purified by a silica gel column (hexane:ethyl acetate/1:1)

Sources & evidence

ORD record
ord-2f2cfe1b3a6f4c788f842376fe0547b0
Source dataset
uspto-grants-2002_09
Patent number
US06444668B1

Reaction notes

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