Cesium carbonate → 1-[5-(3-Chloro-1,2,4-thiadiazol-5-yl)-7-(pyridin-2-yl)-1,3-benzothiazol-2-yl]-3-ethylurea

Participants

Reaction Conditions

Reaction Steps

3,5-dichloro-1,2,4-thiadiazole (50 mg, 0.32 mmol), Cesium carbonate (285.6 mg, 0.88 mmol), Pd(dppf)2C12 (20 mg, 0.03 mmol) and {2-[(ethylcarbamoyl)amino]-7-(pyridin-2-yl)-1,3-benzothiazol-5-yl}boronic acid (100 mg, 0.29 mmol) was suspended in a mixture of THF (9 mL) and water (1 mL) and heated in the microwave at 110° C. for 50 min. The reaction mixture was concentrated in vacuo and the residue partitioned between 10% IPA/DCM (10 mL) and water (10 mL). The organic layer was separated and the aqueous extracted with further 10% IPA/DCM (3×10 mL), the organic layers were combined, dried (MgSO4), filtered and concentrated, then pre-absorbed onto silica and purified by flash column chromatography (Biotage SP4 12 g, 2% MeoH/DCM-5% MeoH/DCM-8% MeOH/DCM) to give 1-[5-(3-chloro-1,2,4-thiadiazol-5-yl)-7-(pyridin-2-yl)-1,3-benzothiazol-2-yl]-3-ethylurea as a brown solid. (100 mg, 81%) MS: 416.92 [M+H]+.

Provenance & Evidence