A simple and practical method for the synthesis of N-substituted-2-aminobenzothiazoles via a crosscoupling reaction of 2-iodo anilines with isothiocyanates is envisaged using nano copper oxide as a recyclable catalyst...A simple and practical method for the synthesis of N-substituted-2-aminobenzothiazoles via a crosscoupling reaction of 2-iodo anilines with isothiocyanates is envisaged using nano copper oxide as a recyclable catalyst and Cs2CO3as a base in PEG-400,as a bio-degradable,reusable,inexpensive and nontoxic reaction medium,under ligand-free conditions.The present tandem process underlines environmental acceptability to access a wide range of N-substituted-2-aminobenzothiazoles in good to excellent yields.展开更多
A novel and efficient approach to the synthesis of 2-substituted benzimidazoles has been developed via CuI/DMEDA-catalyzed coupling reaction and post-cyclization with glacial acetic acid from readily available 2-iodoa...A novel and efficient approach to the synthesis of 2-substituted benzimidazoles has been developed via CuI/DMEDA-catalyzed coupling reaction and post-cyclization with glacial acetic acid from readily available 2-iodoanilines and amides. This method is suitable for the construction of a variety of benzimidazoles in moderate to good yields under short reaction times.展开更多
目的用微波辐射催化法在水相中合成苯并噻唑化合物。方法在150 W微波辐射条件下,以CuCl2和菲啰啉为催化剂,2-碘芳烃、芳醛和硫化钠在100℃水相中反应30min得到目标苯并噻唑化合物。结果合成得到9个相应的苯并噻唑化合物,均通过1 H NMR、...目的用微波辐射催化法在水相中合成苯并噻唑化合物。方法在150 W微波辐射条件下,以CuCl2和菲啰啉为催化剂,2-碘芳烃、芳醛和硫化钠在100℃水相中反应30min得到目标苯并噻唑化合物。结果合成得到9个相应的苯并噻唑化合物,均通过1 H NMR、13 C NMR和质谱确认结构,最高收率为94%。结论使用微波辐射法水相中合成目标产物,与传统方法相比,避免使用大量有机溶剂对环境造成污染,且具有时间短、收率高的优点。展开更多
文摘A simple and practical method for the synthesis of N-substituted-2-aminobenzothiazoles via a crosscoupling reaction of 2-iodo anilines with isothiocyanates is envisaged using nano copper oxide as a recyclable catalyst and Cs2CO3as a base in PEG-400,as a bio-degradable,reusable,inexpensive and nontoxic reaction medium,under ligand-free conditions.The present tandem process underlines environmental acceptability to access a wide range of N-substituted-2-aminobenzothiazoles in good to excellent yields.
基金Acknowledgement We are grateful for support of this project by the National Natural Science Foundation of China （No. J1103307） and the project of Science Foundation of Gansu Province （No. 1208RJZA266）.
文摘A novel and efficient approach to the synthesis of 2-substituted benzimidazoles has been developed via CuI/DMEDA-catalyzed coupling reaction and post-cyclization with glacial acetic acid from readily available 2-iodoanilines and amides. This method is suitable for the construction of a variety of benzimidazoles in moderate to good yields under short reaction times.
文摘目的用微波辐射催化法在水相中合成苯并噻唑化合物。方法在150 W微波辐射条件下,以CuCl2和菲啰啉为催化剂,2-碘芳烃、芳醛和硫化钠在100℃水相中反应30min得到目标苯并噻唑化合物。结果合成得到9个相应的苯并噻唑化合物,均通过1 H NMR、13 C NMR和质谱确认结构,最高收率为94%。结论使用微波辐射法水相中合成目标产物,与传统方法相比,避免使用大量有机溶剂对环境造成污染,且具有时间短、收率高的优点。
