The KI-catalyzed reaction of acetone with aromatic carboxylic acids is achieved, leading to α-acyloxycarbonyl compounds in good to excellent yields under mild reaction conditions. The present method exhibits good functional-group compatibility. Notably, this reaction system is even suitable for cinnamic acid, 3-phenylpropiolic acid and 4-phenylbutanoic acid. A kinetic isotope effect (KIE) study indicates
Group VIII carbamoyl complexes as catalysts for alkyne hydrocarboxylation and electrochemical proton reduction
作者:Chandan Kr Barik、Malcolm E. Tessensohn、Richard D. Webster、Weng Kee Leong
DOI:10.1016/j.jorganchem.2019.03.019
日期:2019.7
A series of group VIII carbamoyl complexes, [M(2-NHC(O)C5H4N)(CO)2(2-SC5H4N)] [where M = Fe, Ru and Os], was found to be efficient and regioselective catalysts for the intramolecular hydroxycarboxylation of α,ω-alkynoic acids, yielding exocyclic enol lactones for ring sizes up to 7 atoms, and endocyclic enol lactones for ring sizes up to 12 atoms. They also catalysed the regioselective intermolecular
发现了一系列的VIII族氨基甲酰基配合物,[M(2-NHC(O)C 5 H 4 N)(CO)2(2-SC 5 H 4 N)] [其中M = Fe,Ru和Os]是有效的区域选择性催化剂,可用于α,ω-链烷酸的分子内羟基羧化反应,可制得环尺寸最大为7个原子的环外烯醇内酯,而环尺寸最大可形成12个原子的内环烯醇内酯。他们还催化了炔丙醇和羧酸之间的区域选择性分子间羟基羧化反应,形成β-氧代酯。这些络合物还可以在质子还原中充当电催化剂,对其氧化还原电位的评估表明,铁络合物比钌或类似物的效率要高得多。
Oxidative C–H Acyloxylation of Acetone with Carboxylic Acids under Iodine Catalysis
作者:Xiao-Yu Zhou、Xia Chen
DOI:10.1055/a-1336-5720
日期:2021.5
Iodine-catalyzed oxidative C(sp3)–H acyloxylation of acetone with carboxylic acids has been developed. The method employs iodide as catalyst and sodium chlorite as oxidant. Substituted benzoic acids, naphthoic acids and heteroaromatic carboxylic acids can be used, and 2-oxopropyl carboxylates are obtained with good to excellent yields.