Quinoxalines. XXVII. The cyanation of 2-substituted quinoxaline 4-oxides with trimethylsilyl cyanide.
作者:Chihoko IIJIMA、Akira MIYASHITA
DOI:10.1248/cpb.38.661
日期:——
The deoxy-cyanation of 2-substituted quinoxaline 4-oxides (Ia-k) with trimethylsilyl cyanide in the presence of 1, 8-diazabicyclo[5.4.0]undec-7-ene gave the corresponding 3-substituted 2-quinoxalinecarbonitriles (IIa-k). However, in the case of 2-(p-tolylsulfonyl)quinoxaline 4-oxide (II), the substitution with cyanide ion proceeded together with deoxy-cyanation to give 2, 3-quinoxalinedicarbonitrile (III).
用三甲基硅基氰化物在1,8-二氮杂双环[5.4.0]十一烯存在下对2-取代的喹啉烯 4-氧化物(Ia-k)进行去氧氰化反应,得到相应的3-取代2-喹啉氰化物(IIa-k)。然而,在2-(对甲苯磺酰基)喹啉烯 4-氧化物(II)的情况下,氰离子取代与去氧氰化同时进行,生成2, 3-喹啉二氰化物(III)。