Methanesulfonic Acid → 1-Ethyl-3-[5-hydroxy-7-(4-methyl-pyridin-2-yl)-benzothiazol-2-yl]-urea
Reaction equation
C([O:8][C:9]1[CH:10]=[C:11]([C:24]2[CH:29]=[C:28]([CH3:30])[CH:27]=[CH:26][N:25]=2)[C:12]2[S:16][C:15]([NH:17][C:18]([NH:20][CH2:21][CH3:22])=[O:19])=[N:14][C:13]=2[CH:23]=1)C1C=CC=CC=1.CS(O)(=O)=O>ClCCl>[CH2:21]([NH:20][C:18]([NH:17][C:15]1[S:16][C:12]2[C:11]([C:24]3[CH:29]=[C:28]([CH3:30])[CH:27]=[CH:26][N:25]=3)=[CH:10][C:9]([OH:8])=[CH:23][C:13]=2[N:14]=1)=[O:19])[CH3:22]Participants
4
Procedure
A stirred solution of 1-[5-Benzyloxy-7-(4-methyl-pyridin-2-yl)-benzothiazol-2-yl]-3-ethyl-urea (100 mg, 0.239 mmol) in anhydrous dichloromethane (2 ml) was treated with methanesulfonic acid (0.25 ml) and kept at ambient temperature for 2 h. The dichloromethane was then evaporated off and the residue treated with water (3 ml). The resultant mixture was extracted with ethyl acetate (3×20 ml) and the aqueous portion basified with sodium hydrogen carbonate. The resultant mixture was extracted with ethyl acetate (3×30 ml), dried (MgSO4) and the solvent removed in vacuo to give the crude 1-Ethyl-3-[5-hydroxy-7-(4-methyl-pyridin-2-yl)-benzothiazol-2-yl]-urea (38 mg, 46%) as an off-white solid which was used without further purification.
Workup
- customThe dichloromethane was then evaporated off
- additionthe residue treated with water (3 ml)
- extractionThe resultant mixture was extracted with ethyl acetate (3×20 ml)
- extractionThe resultant mixture was extracted with ethyl acetate (3×30 ml)
- dry with materialdried (MgSO4)
- customthe solvent removed in vacuo
Sources & evidence
- ORD record
- ord-573dc3a655404e64a3fcf489719bbca4
- Source dataset
- uspto-grants-2013_07
- Patent number
- US08481544B2
Reaction notes
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