Tri-n-butyl tin chloride (0.16 mL) was added to a solution of sodium azide (0.039 g) in DMF (0.6 mL) and the mixture was stirred for 5 minutes. Tetra-butyl ammonium bromide (0.0065 g) was then added, followed by N-(1-cyano-5,6,7,8-tetrahydronaphthalen-2-yl)benzenesulfonamide (Intermediate 1, 0.177 g). The mixture was heated by microwave irradiation at 220° C. for 1 hour. The solution was then acidified with 1N hydrochloric acid and the products were extracted into DCM, dried with magnesium sulfate and filtered. The filtrate was evaporated to dryness and the residue was purified by preparative HPLC (C18). The fractions containing the desired product were combined, and the solvent was removed by evaporation to give the title compound as a beige solid (0.01 g).
