作者:Neasa McNabola、Cornelius J. O'Connor、Mark D. Roydhouse、Michael D. Wall、J. Mike Southern
DOI:10.1016/j.tet.2015.05.032
日期:2015.7
A one-pot approach to the synthesis of 3-nitrothiophene and 3-nitro-2-substituted thiophenes has been developed. Exposure of 1,4-dithane-2,5-diol to nitroacetates or nitroalkenes in the presence of 25% triethylamine and subsequent treatment with molecular sieves and combinations of silica gel or acidic alumina with DDQ or chloranil formed 3-nitrothiophene or a number of 3-nitro-2-substituted thiophenes
已经开发了一种一锅法合成3-硝基噻吩和3-硝基-2-取代噻吩的方法。在25%三乙胺的存在下,将1,4-二烷-2,5-二醇暴露于硝基乙酸盐或硝基烯烃中,随后用分子筛处理,再将硅胶或酸性氧化铝与DDQ或氯乙腈混合使用,形成3-硝基噻吩或许多具有完全区域控制的3-硝基-2-取代的噻吩。对于大多数合成后应用,简单的后处理程序就无需通过色谱法纯化。