Sodium hydride → 4-Fluorobenzyl-6-methyl-1H-benzo[d][1,3]oxazine-2,4-dione

HRID 970476Notes

Reaction equation

HRID 970476 reaction equation
[CH3:1][C:2]1[CH:13]=[CH:12][C:5]2[NH:6][C:7](=[O:11])[O:8][C:9](=[O:10])[C:4]=2[CH:3]=1.[H-].[Na+].[F:16][C:17]1[CH:24]=[CH:23][C:20]([CH2:21]Br)=[CH:19][CH:18]=1>CN(C=O)C>[F:16][C:17]1[CH:24]=[CH:23][C:20]([CH2:21][N:6]2[C:5]3[CH:12]=[CH:13][C:2]([CH3:1])=[CH:3][C:4]=3[C:9](=[O:10])[O:8][C:7]2=[O:11])=[CH:19][CH:18]=1

Participants

5

Reactant 3

HCID 24758Sodium hydrideHCID 680214-Fluorobenzyl bromideHCID 2944785-Methylisatoic anhydride

Product 1

HCID 865946424-Fluorobenzyl-6-methyl-1H-benzo[d][1,3]oxazine-2,4-dioneYield 79%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent2×

Procedure

A solution of Compound 11 (5 g, 28 mmol) in DMF was added slowly to a suspension of NaH (60% in mineral oil, 1.24 g, 31 mmol) in DMF and further stirred at room temperature for 1 h. Then, neat 4-fluorobenzyl bromide (3.81 mL, 31 mmol) was added, and the solution further stirred at room temperature for 3 h. The solution was poured into ice water and the solids formed were filtered, washed several times by water, and dried. The solids were suspended in hexane, sonicated briefly, filtered, and washed by hexane to yield 6.3 g (79%) of white solids. M.P. 153° C. 1H NMR (DMSO-d6): δ 2.32 (s, 3H), 5.24 (s, 2H), 7.14-7.17 (m, 3H), 7.44 (m, 2H), 7.54 (dd, J=1.7, 8.2 Hz, 1H), 7.83 (d, J=1.2 Hz, 1H). Anal. (C16H12FNO3) C, H, N.

Workup

  1. stirringthe solution further stirred at room temperature for 3 h
  2. customthe solids formed
  3. filtrationwere filtered
  4. washwashed several times by water
  5. customdried
  6. customsonicated briefly
  7. filtrationfiltered
  8. washwashed by hexane

Sources & evidence

ORD record
ord-ce4a8ae08e1e4e8ea0f1f49272211393
Source dataset
uspto-grants-2007_12
Patent number
US07312220B2

Reaction notes

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