O.Br.Br.[CH3:4][N:5]([CH:15]1[CH2:20][CH2:19][NH:18][CH2:17][CH2:16]1)[C:6]1[S:7][C:8]2[CH:14]=[CH:13][CH:12]=[CH:11][C:9]=2[N:10]=1.[OH-].[Na+]>O>[CH3:4][N:5]([CH:15]1[CH2:20][CH2:19][NH:18][CH2:17][CH2:16]1)[C:6]1[S:7][C:8]2[CH:14]=[CH:13][CH:12]=[CH:11][C:9]=2[N:10]=1A solution of 427 parts of N-methyl-N-(4-piperidinyl)-2-benzothiazolamine dihydrobromide monohydrate in 1500 parts of water was treated with a sodium hydroxide solution 50%. The product was extracted twice with trichloromethane. The combined organic layers were washed with water, dried, filtered and evaporated. The residue was crystallized from 490 parts of 2,2'-oxybispropane. The product was filtered off and dried, yielding 248 parts (100%) of N-methyl-N-(4-piperidinyl)-2-benzothiazolamine; mp. 86.9° C. (68).
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