Synthesis of New Quinoxaline Derivatives by Reductive Cyclization of Various 1-(2-Nitrophenyl)-2-cyanoamines
作者:Tristan Renaud、Jean-Pierre Hurvois、Philippe Uriac
DOI:10.1002/1099-0690(200103)2001:5<987::aid-ejoc987>3.0.co;2-b
日期:2001.3
six-membered N-(2-nitrophenyl) heterocyclic amines, including piperidine, morpholine, thiomorpholine, and N-Boc-protected piperazine derivatives, was investigated. The expected cyanoamines 5 were obtained in good yields and subjected to catalytic hydrogenation to afford the corresponding cyclic amidine N-oxides 6. The reductive cyclization proceeded through the formation of a hydroxylamine, which cyclized
研究了包括哌啶,吗啉,硫代吗啉和N -Boc保护的哌嗪衍生物在内的各种六元N-(2-硝基苯基)杂环胺的电化学氰化反应。预期cyanoamines 5以良好产率得到并经受催化氢化,得到相应的环脒Ñ -oxides 6。还原环化通过羟胺的形成进行,羟胺环化到氰基部分上。环化反应的立体选择性进行了研究用于两种情况下的反式- 5F,其中2-氰基的取代基是轴向和4-甲基取代基赤道,和顺式- 5F,其中2-氰基和4-甲基取代基两者都是赤道。预期的四氢喹喔啉3可以在随后的步骤中,在Pearlman's催化剂的存在下,在五个大气压的氢气压力下,通过环catalytic 6的催化氢化来方便地制备。