Facile Synthesis of CarboxylicAnhydrides Using 4,5-Dichloro-2-[(4-nitrophenyl)sulfonyl]pyridazin-3(2<i>H</i>)-one
作者:Yong-Jin Yoon、Jeum-Jong Kim、Yong-Dae Park、Woo Song Lee、Su-Dong Cho
DOI:10.1055/s-2003-40512
日期:——
A novel and facile synthesis of carboxylic anhydrides from carboxylicacidusing 4,5-dichloro-2-[(4-nitrophenyl)sulfonyl[pyridazin-3(2H)-one (2) is presented. Treatment of aliphatic or aromaticcarboxylicacids with 2 in the presence of base in organic solvents gave the corresponding anhydrides in good or excellent yields.
P<sup>III</sup>
-Chelation-Assisted Indole C7-Arylation, Olefination, Methylation, and Acylation with Carboxylic Acids/Anhydrides by Rhodium Catalysis
作者:Xiaodong Qiu、Panpan Wang、Dingyi Wang、Minyan Wang、Yu Yuan、Zhuangzhi Shi
DOI:10.1002/anie.201813182
日期:2019.1.28
olefination, and methylation of indoles with carboxylic acids or anhydrides by C−H and C−C bond activation have been developed. Furthermore, C7‐acylation products can also be generated selectively at a lower reaction temperature in the developed system. The key to the high reactivity and regioselectivity of this transformation is the appropriate choice of an indole N‐PtBu2 chelation‐assisted group