Potassium Carbonate → 1-Benzothiazol-6-yl-3-[4-(2-morpholin-4-yl-ethoxy)-pyridin-3-yl]-imidazolidin-2-one

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1-Benzothiazol-6-yl-3-(4-chloro-pyridin-3-yl)-imidazolidin-2-one (I-180a: 100 mg, 0.3023 mmol) was refluxed with 2-morpholin-4-yl-ethanol (60 mg, 0.4534 mmol), potassium hydroxide (68 mg, 1.2092 mmol), potassium carbonate (42 mg, 0.3023 mmol), 18-crown-ether (8 mg, 0.0302 mmol) and toluene (3 mL) at 120° C. to afford the crude product. The reaction was monitored by TLC (10% MeOH in chloroform). Purification by column chromatography on silica gel (3.5% methanol in chloroform) followed by hexane wash and ether wash afforded 8.5 mg of the product (6.6% yield).

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