Efficient N-arylation of azole compounds utilizing selective aryl-transfer TMP-iodonium(III) reagents
作者:Daichi Koseki、Erika Aoto、Toshitaka Shoji、Kazuma Watanabe、Yasuko In、Yasuyuki Kita、Toshifumi Dohi
DOI:10.1016/j.tetlet.2019.04.012
日期:2019.5
It was determined that diaryliodonium(III) triflates bearing a trimethoxybenzene (TMP) auxiliary are more reactive than the reported selective aryl-transfer iodonium salts in the N-arylation of benzimidazoles and other types of azole compounds under catalytic conditions. The TMP-iodonium(III) salts can thus effectively facilitate the reaction at 50 °C or below, producing the corresponding N-arylated
已确定在催化条件下,在苯并咪唑和其他类型的唑化合物的N-芳基化反应中,带有三甲氧基苯(TMP)助剂的二芳基碘鎓(III)三氟甲磺酸盐比报道的选择性芳基转移碘鎓盐更具反应性。因此,TMP-碘鎓(III)盐可以有效地促进在50℃或更低的温度下反应,产生相应的N-芳基化的联芳基,而不会形成TMP-衍生的偶联副产物。在温和的条件下使用该TMP试剂可防止潜在的辅助基团参与偶联反应的问题,这是在使用需要升高温度的碘鎓(III)盐时观察到的。