Rh(III)-Catalyzed Dual C–H Functionalization and C–O/C–N Annulations of Monoamide Fumarates
作者:Zhi-Jian Han、Ze-Xuan Zhang、Jin-Jin Lin、Bin Ma、Lu-Xi Yang、Wei-Gao Pu、Yu-Min Li、Hao Chen、Chao-Shan Da
DOI:10.1021/acs.joc.2c02091
日期:2022.11.18
can produce pyrano[4,3-c]pyridine-1,5(6H)-diones in high yield (up to 82%) in a single step. The substrates of monoamide fumarates and acetylenes are structurally simple, readily available, and inexpensive. The additive AgSbF6 effectively raised the yields. On account of easier dehydrogenation of OH in the COOH group than NH in the amide group in the reaction, the process first undergoes C–O annulation
吡喃并[4,3 - c ]吡啶二酮是生物活性化合物和功能材料的关键骨架,通常使用昂贵的底物通过多步合成制备。这项工作表明,Rh(III) 催化的双 C(sp 2 )–H 官能化和单酰胺富马酸酯的 C–O/C–N 环化可以产生吡喃[4,3- c ]吡啶-1,5(6 H ) -单步高产率(高达 82%)的二酮。单酰胺富马酸酯和乙炔的底物结构简单、容易获得且价格低廉。添加剂AgSbF 6有效提高了产量。由于反应中COOH基团中的OH比酰胺基团中的NH更容易脱氢,该过程首先进行C-O环化,然后进行C-N环化。