Cesium carbonate → 3-(2-tert-Butoxycarbonylamino-ethoxy)-4-cyano-benzoic acid methyl ester

Participants

Reaction Steps

(2-Bromoethyl)carbamic acid tert-butyl ester (700 mg, 3.12 mmol) from step 1 and 4-cyano-3-hydroxybenzoic acid methyl ester (Example 34 Step 3, 550 mg, 3.12 mmol) was dissolved in DMF (4.5 ml). Cs2CO3 (2.03 g, 6.24 mmol) was added and the reaction stirred at room temperature for 2 hours. The reaction mixture was filtered through celite and washed with DMF (3×10 mL). The DMF was removed in vacuo. The residue was purified by flash chromatography (12% EtOAc/Hexane) to yield the desired product.

Provenance & Evidence