2-(4-Chloro-phenyl)-4H-furo[3,2-b]pyrrole-5-carboxylic acid ethyl ester (60.97 mg, 0.21 mmol), prepared by the procedure described above (see, Compound 4), (3-isothiocyanopropyl)phosphonic acid diethyl ester (500 mg, 2.1 mmol) and a fine powder of anhydrous K2CO3 (27.6 mg, 0.2 mmol) were mixed together in a sealed tube, provided with a magnetic stirrer, and the mixture was heated at 110° C. for 2 hours. The mixture was then cooled to room temperature, ethanol (2 ml) was added, and the formed precipitate was filtered. The compound was recrystallized from ethanol to give of Compound 27 (60 mg, 60% yield).
