A Convenient and Facile Synthesis of Fluorine-Containing 1<i>H</i>-,2<i>H</i>-Benz[<i>g</i>]indazoles and Naphthisoxazoles by Aromatic Nucleophilic<i>N-N</i>Exchange Reaction of<i>N,N</i>-Dimethyl-2,4-bis(trifluoroacetyl)-1-naphthylamine with Hydrazines and Hydroxylamine
作者:Masaru Hojo、Ryōichi Masuda、Etsuji Okada
DOI:10.1055/s-1990-26911
日期:——
N,N-Dimethyl-2,4-bis(trifluoroacetyl)-1-naphthylamine (1) undergoes an aromatic nucleophilic N-N exchange reaction with hydrazines followed by cyclocondensation to afford the corresponding fluorine-containing 1H- and 2H-benz[g]indazoles 2, 3 in excellent yields. This reaction can be extended to the synthesis of 5-trifluoroacetyl-3-trifluoromethylnaphth[1,2-c]isoxazole (5) using hydroxylamine.
N,N-二甲基-2,4-双(三氟乙酰基)-1-萘胺(1)与肼发生芳香族亲核N-N交换反应,然后环缩合得到相应的含氟1H-和2H-苯并[g]吲唑2、3 产量极佳。该反应可以扩展到使用羟胺合成 5-三氟乙酰基-3-三氟甲基萘[1,2-c]异恶唑 (5)。