Compound 39.2 (100 mg, 0.22 mmol) was dissolved in DCM, and pyridine (0.05 mL) and NCS (30 mg, 0.22 mmol) were added. The resulting mixture was stirred at room temperature for 3 hours. Additional NCS (60 mg) was added, and the mixture was left at room temperature overnight. Then TEA (0.4 mL) was added to the mixture, and a stream of methylacetylene was passed through the reaction mixture for 20 minutes. LCMS detected the desired product. The solvent was removed, and the residue was purified by CombiFlash to give 39.3.
