Potassium Iodide → 5-chloro-1,3-dihydro-1-{1-[3-(2-oxo-3(2H)-benzothiazolyl)propyl]-4-piperidinyl}-2H-benzimidazol-2-one

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Reaction Steps

A mixture of 5.4 parts of 3-(3-bromopropyl)-2(3H)-benzothiazolone, 4.5 parts of 5-chloro-1,3-dihydro-1-(4-piperidinyl)-2H-benzimidazol-2-one, 5.3 parts of sodium carbonate, 0.1 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone is stirred and refluxed for 3 hours with water-separator. After cooling, water is added and the layers are separated. The organic phase is dried, filtered and evaporated. The residue is crystallized from a mixture of 4-methyl-2-pentanone and 2-propanone. The product is filtered off and dried, yielding 2.5 parts (31%) of 5-chloro-1,3-dihydro-1-{1-[3-(2-oxo-3(2H)-benzothiazolyl)propyl]-4-piperidinyl}-2H-benzimidazol-2-one; mp. 184.1° C.

Provenance & Evidence