Sodium hydride → 2-Methoxyethyl 4-hydroxy-2-methyl-2H-1,2-benzothiazine-3-carboxylate 1,1-dioxide

HRID 354635Notes

Reaction equation

HRID 354635 reaction equation
[CH3:1][N:2]1[C:12](=[O:13])[C:11]2[C:6](=[CH:7][CH:8]=[CH:9][CH:10]=2)[S:3]1(=[O:5])=[O:4].Cl[CH2:15][C:16]([O:18][CH2:19][CH2:20][O:21][CH3:22])=[O:17].[H-].[Na+]>CS(C)=O>[OH:13][C:12]1[C:11]2[CH:10]=[CH:9][CH:8]=[CH:7][C:6]=2[S:3](=[O:5])(=[O:4])[N:2]([CH3:1])[C:15]=1[C:16]([O:18][CH2:19][CH2:20][O:21][CH3:22])=[O:17]

Participants

5

Reactant 3

HCID 24758Sodium hydrideHCID 272902-methyl-1,2-benzisothiazol-3(2H)-one 1,1-dioxideHCID 2214302-Methoxyethyl Chloroacetate

Product 1

HCID 546793412-Methoxyethyl 4-hydroxy-2-methyl-2H-1,2-benzothiazine-3-carboxylate 1,1-dioxide

Reagents, catalysts & solvents 1

HCID 679Dimethyl SulfoxideSolvent

Procedure

To a solution of 3.0 g. (0.015 mole) of N-methylsaccharin and 2.3 g. (0.015 mole) of 2-methoxyethyl chloroacetate in 15 ml. of dimethylsulfoxide at 40° C. was added 810 mg. (0.033 mole) of sodium hydride over a 2 hour period. The resulting reaction mixture was stirred for 2 hours at 40°-50° C. and was then quenched in 5% hydrochloric acid solution. The resulting suspension was extracted with methylene chloride (2×100 ml.) and the organic layers separated, combined and washed with water (50 ml.) and a brine solution (50 ml). The organic layer was dried over magnesium sulfate and concentrated to an oil, 4.1 g. The product was purified by dissolution of the residue in 5 ml. of acetone and addition of the acetone slowly to 125 ml. of 0.25 N hydrochloric acid. The suspension was allowed to stir for several hours, and was then filtered and dried 2.6 g. (55%). The product is indistinguishable from that reported in U.S. Patent Application Ser. No. 191,716, filed Sept. 29, 1980.

Workup

  1. customThe resulting reaction mixture
  2. customwas then quenched in 5% hydrochloric acid solution
  3. extractionThe resulting suspension was extracted with methylene chloride (2×100 ml.)
  4. customthe organic layers separated
  5. washwashed with water (50 ml.)
  6. dry with materialThe organic layer was dried over magnesium sulfate
  7. concentrationconcentrated to an oil, 4.1 g
  8. customThe product was purified by dissolution of the residue in 5 ml
  9. additionof acetone and addition of the acetone slowly to 125 ml
  10. stirringto stir for several hours
  11. filtrationwas then filtered
  12. customdried 2.6 g

Sources & evidence

ORD record
ord-a17896856e314717a39f4bb1fe43c9c9
Source dataset
uspto-grants-1983_03
Patent number
US04376204

Reaction notes

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