Dibutyltin oxide → HCID 178439871、化合物

(E)-[2-(2-Propylbenzimidazol-1-yl)methyl-10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-ylidene]acetonitrile (200 mg, 0.496 mmol) obtained in Example 1 was dissolved in toluene (5 mL), trimethylsilylazide (1.3 mL, 9.92 mmol) and dibutyltin oxide (123 mg, 0.496 mmol) were added, and the mixture was stirred at 90° C. for 24 hr. The mixture was concentrated under reduced pressure, and the residue was purified by silica gel column chromatography (chloroform/methanol=99/1) to give the title compound (compound 4) (111 mg, 50%).