Hydrochloric Acid → HCID 20375548, compound

HRID 1448787Notes

Reaction equation

HRID 1448787 reaction equation
[CH3:1][N:2]1[C:7](=[O:8])[CH2:6][C:5]2[CH:9]=[CH:10][S:11][C:4]=2[S:3]1(=[O:13])=[O:12].[CH2:14]([N:21]=[C:22]=[O:23])[C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1.C(N(CC)CC)C.Cl>CS(C)=O>[OH:8][C:7]1[N:2]([CH3:1])[S:3](=[O:13])(=[O:12])[C:4]2[S:11][CH:10]=[CH:9][C:5]=2[C:6]=1[C:22](=[O:23])[NH:21][CH2:14][C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1

Participants

6

Reactant 4

HCID 313Hydrochloric AcidHCID 8471TriethylamineHCID 76639Benzyl isocyanateHCID 20375549HCID 20375549, compound

Product 1

HCID 20375548HCID 20375548, compound

Reagents, catalysts & solvents 1

HCID 679Dimethyl SulfoxideSolvent

Procedure

1 g (4.6 mmol) of 3,4-dihydro-2-methyl-3-oxo-2H-thieno[3,2-e]-1,2-thiazine 1,1-dioxide are stirred at room temperature for 3 hours under nitrogen with 0.61 g (4.6 mmol) of benzylisocyanate and 0.47 g (4.6 mmol) of triethylamine in 10 ml of absolute dimethylsulfoxide. Thereafter, the mixture is poured into 40 ml of 2-N hydrochloric acid and 25 g of ice and stirred for 20 minutes. The separated precipitate is filtered off under suction and washed neutral with water. The precipitate is dissolved in 200 ml of methylene chloride, the turbid solution is dried over sodium sulfate, stirred with 0.3 g of active carbon and filtered. The filtrate is extracted with five 100 ml portions of saturated sodium carbonate solution, each of the aqueous phases being re-extracted with a small amount of methylene chloride. The combined aqueous phases are acidified to pH 1 with concentrated hydrochloric acid. The separated product is extracted with two 150 ml of methylene chloride. The combined organic phases are dried over sodium sulfate, whereupon the solvent is distilled off. For purification, the product is recrystallized from ca 40 ml of methanol. There is obtained 3-hydroxy-2-methyl-4-benzylcarbamoyl-2H-thieno[3,2-e]-1,2-thiazine 1,1-dioxide of melting point 176°-177° C.

Workup

  1. filtrationThe separated precipitate is filtered off under suction
  2. washwashed neutral with water
  3. dissolutionThe precipitate is dissolved in 200 ml of methylene chloride
  4. dry with materialthe turbid solution is dried over sodium sulfate
  5. stirringstirred with 0.3 g of active carbon
  6. filtrationfiltered
  7. extractionThe filtrate is extracted with five 100 ml portions of saturated sodium carbonate solution
  8. extractioneach of the aqueous phases being re-extracted with a small amount of methylene chloride
  9. extractionThe separated product is extracted with two 150 ml of methylene chloride
  10. dry with materialThe combined organic phases are dried over sodium sulfate, whereupon the solvent
  11. distillationis distilled off
  12. customFor purification
  13. customthe product is recrystallized from ca 40 ml of methanol

Sources & evidence

ORD record
ord-95b4d33bd715478e9c72e0953e67a102
Source dataset
uspto-grants-1980_02
Patent number
US04187303

Reaction notes

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