When a mixture of o-alkynylaryl isocyanides and organic dichalcogenides such as diselenides or ditellurides was irradiated with light of wavelength over 300 or 400 nm, the intramolecular cyclization of the isocyanides took place to afford the corresponding 2,4-bischalcogenated quinolines selectively. The photochemical cyclization of 2-(phenylethynyl)phenyl isocyanide could also proceed in the presence of hydrogen transfer reagents such as tris(trimethylsilyl)silane, tributylgermyl hydride, alkanethiols, and benzeneselenol, providing the corresponding 3-phenylquinoline as the result of 2,4-dihydrogenation.
当邻炔基芳基异
氰化物与有机双
碲化合物(如二
硒化物或
碲化物)混合物在波长大于300或400纳米的光照射下,异
氰化物发生分子内环化反应,选择性地生成相应的2,4-双亚
碲基
喹啉。2-(
苯乙炔基)苯基异
氰化物的光
化学环化反应,在氢转移试剂如三(三甲基
硅基)
硅烷、三丁基
锗烷、烷基
硫醇和
苯硒酚的存在下也能进行,生成2,4-二氢化的
3-苯基喹啉。