(glyoxal) as the double carbonylation reagent. Simple CuCl2⋅2H2O (copper(II) chloride dihydrate) was used as the oxidant for this transformation. Under optimized reaction conditions, various primary and secondary anilines were double-carbonylated to afford their corresponding isatins (26 examples, up to 80% yields).
已经证明了一种新颖的双羰基化方法,使用容易获得的HCOCOH(
乙二醛)作为双羰基化试剂。简单的CuCl 2 ⋅2H 2 O(
氯化铜二水合物)作为氧化剂用于该转化。在优化的反应条件下,将各种
伯胺和仲
苯胺进行双羰基化反应,得到相应的
靛红(26个实例,收率最高80%)。