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Sodium Carbonate → 5-(4-acetylpyridin-3-yl)-3-methylbenzo[d]oxazol-2(3H)-one

HRID 1253927
Notes
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Reaction equation

HRID 1253927 reaction equation
Br[C:2]1[CH:3]=[N:4][CH:5]=[CH:6][C:7]=1[C:8](=[O:10])[CH3:9].[CH3:11][N:12]1[C:16]2[CH:17]=[C:18](B3OC(C)(C)C(C)(C)O3)[CH:19]=[CH:20][C:15]=2[O:14][C:13]1=[O:30].C(=O)([O-])[O-].[Na+].[Na+]>C1(C)C=CC=CC=1.C(O)C.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:8]([C:7]1[CH:6]=[CH:5][N:4]=[CH:3][C:2]=1[C:18]1[CH:19]=[CH:20][C:15]2[O:14][C:13](=[O:30])[N:12]([CH3:11])[C:16]=2[CH:17]=1)(=[O:10])[CH3:9]
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

Participants

7

Reactant 3

HCID 10340Sodium CarbonateHCID 137934561-(3-Bromopyridin-4-yl)ethan-1-oneHCID 595350693-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-2(3H)-benzoxazolone

Product 1

HCID 498020215-(4-acetylpyridin-3-yl)-3-methylbenzo[d]oxazol-2(3H)-oneYield 55.2%

Reagents, catalysts & solvents 3

HCID 178418397
HCID 178418397, compound
Catalyst
HCID 702EthanolSolvent
HCID 1140TolueneSolvent

Conditions

Temperature
90 °C

Procedure

A mixture of 1-(3-bromopyridin-4-yl)ethanone (50 mg, 0.250 mmol), 3-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzo[d]oxazol-2(3H)-one (68.8 mg, 0.250 mmol), polymer bound PalladiumTetrakis (56.8 mg, 6.25 μmol) and sodium carbonate (250 μl, 0.500 mmol) in toluene (1 mL) and ethanol (1 mL) was heated to 90° C. in microwave for 45 min. After filtration through a pad of Na2SO4, the solvent was removed in vacuum. The residue was purified by flash column (MeOH—CH2Cl2, v/v, 1%-1.5%) and yielded colorless solid (37 mg). ESI-MS m/z: 269.0 [M+1]+, Retention time 1.03 min; 1H NMR (400.3 MHz, CDCl3): δ 2.13 (s, 3H), 344 (s, 3H), 6.95 (d, J=1.48 Hz, 1H), 7.07 (dd, J=8.2, 1.68 Hz, 1H), 7.29 (d, J=8.2 Hz, 1H), 7.37 (d J=5 Hz, 1H), 8.69 (s, 1H), 8.73 (d, J=5 Hz, 1H).

Workup

  1. filtrationAfter filtration through a pad of Na2SO4
  2. customthe solvent was removed in vacuum
  3. customThe residue was purified by flash column (MeOH—CH2Cl2, v/v, 1%-1.5%)

Sources & evidence

ORD record
ord-c04d8fb8b23f452095a50db93690123c
Source dataset
uspto-grants-2013_06
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US08455522B2

Reaction notes

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On this pageParticipantsConditionsProcedureWorkupSources & evidenceReaction notes