A Facile Synthesis of Substituted 1,8-Naphthyridines Based on the Aza-Wittig/Electrocyclic Ring Closure Strategy
作者:José Ma Quintela、Carmen Veiga、Carlos Peinador、Marcos Chas、Antonio Fernández
DOI:10.3987/com-05-10629
日期:——
obtained from the 2-chloro-5-cyano-6-ethoxy-4-phenylpyridine-3-carboxaldehyde (1), react with heterocumumulenes such as aromatic isocyanates to give directly the title compounds in an aza-Wittig/electrocyclic ring closure process. The yields were from 60% to 97%.
已经通过氮杂-维蒂希反应合成了几种新的 1,8-萘啶衍生物 (7) 和 (8)。亚氨基正膦、2-乙氧基-3-氰基-5-(2-乙氧基羰基)-4-苯基-6-[(三苯基正膦亚基)氨基]吡啶(4)和2-乙氧基-3-氰基-5-(2-氰基乙烯基) -4-phenyl-6[(triphenylphosphoranilidene)-amino]pyridine (5),很容易从 2-chloro-5-cyano-6-ethoxy-4-phenylpyridine-3-carboxaldehyde (1) 中得到芳族异氰酸酯在氮杂维蒂希/电环闭合过程中直接得到标题化合物。产率为 60% 至 97%。