Methyl iodide → 6-Fluoro-1-methyl-2H-3,1-benzoxazine-2,4(1H)-dione

HRID 970585Notes

Reaction equation

HRID 970585 reaction equation
[F: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+].[CH3:16]I>CN(C=O)C>[F:1][C:2]1[CH:13]=[CH:12][C:5]2[N:6]([CH3:16])[C:7](=[O:11])[O:8][C:9](=[O:10])[C:4]=2[CH:3]=1

Participants

5

Reactant 3

HCID 6328Methyl iodideHCID 24758Sodium hydrideHCID 2885605-Fluoroisatoic anhydride

Product 1

HCID 127132306-Fluoro-1-methyl-2H-3,1-benzoxazine-2,4(1H)-dioneYield 57%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent2×

Procedure

A solution of Compound 35 (3 g, 16.57 mmol) in DMF was added slowly to a suspension of NaH (60% in mineral oil, 0.729 g, 18.23 mmol) in DMF and further stirred at room temperature for 1 h. Then, neat methyl iodide (1.14 mL, 18.23 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 1.84 g (57%) of white solids. M.P. 133° C. 1H NMR (DMSO-d6): δ 3.90 (s, 3H), 7.51 (dd, J=4.0, 8.8 Hz, 1H), 7.77 (m, 12). Anal. (C9H6FNO3) 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-b3a7aa5b59fa4539896efa85a379169b
Source dataset
uspto-grants-2007_12
Patent number
US07312221B2

Reaction notes

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