作者:Anna Junker、Junichiro Yamaguchi、Kenichiro Itami、Bernhard Wünsch
DOI:10.1021/jo400692p
日期:2013.6.7
steps from thiophene, was arylated regioselectively at the α-position directly with iodoarenes. Since 2 offers several reactive positions, various established catalyst systems were tested. It was found that Crabtree catalyst (an Ir catalyst) converted efficiently and selectively the thiophene system 2 into 2-aryl-substituted compounds 9. The direct C–H arylation of 2 with electron-rich iodoarenes led to
据报道,采用后期多样化策略可以快速合成基于噻吩的TAK-779类似物1。在合成结束时,由噻吩分六步制备的关键结构单元2直接与碘代芳烃在α位置进行区域选择性芳基化。由于2提供了多个反应性位置,因此测试了各种已建立的催化剂体系。发现Crabtree催化剂(Ir催化剂)有效且选择性地将噻吩系统2转化为2-芳基取代的化合物9。的直接C-H芳基化2富含电子的碘代芳烃的收率很高,而缺乏电子的碘代芳烃需要更长的反应时间才能完全转化。通过水解9和随后的HATU与伯胺4的合成来合成一小组多样化的酰胺1。