A new regioselective synthesis of 3-substituted furan-2(5H)-ones by palladium-catalysed reductive carbonylation of alk-1-ynes
作者:Bartolo Gabriele、Giuseppe Salerno、Mirco Costa、Gian Paolo Chiusoli
DOI:10.1016/s0040-4039(98)02464-2
日期:1999.1
or 3-aryl-substituted furan-2(5H)-ones are obtained directly in fair yields by reductive carbonylation of alk-1-ynes in the presence of catalytic amounts of palladium iodide in conjunction with potassium iodide (10 eq.) and water (200 eq.). Simultaneous oxidation of CO to CO2 accounts for the stoichiometry of the process. Reactions are carried out in dioxane under mild conditions (80 °C and 10 atm of
Antifungal 3,5-disubstituted furanones: From 5-acyloxymethyl to 5-alkylidene derivatives
作者:Petr Šenel、Lucie Tichotová、Ivan Votruba、Vladimír Buchta、Marcel Špulák、Jiří Kuneš、Milan Nobilis、Ondřej Krenk、Milan Pour
DOI:10.1016/j.bmc.2010.01.030
日期:2010.3
parent furanone structure were therefore prepared and evaluated. In line with the ease of elimination of the substituent from C5, low activities of the 5-alkoxy compounds were observed. On the other hand, their 5-aryloxymethyl congeners were found to be capable of liberating the antifungally active 5-methylene furanone into the testing medium. The antifungal effect of the 5-alkylidene derivatives was
Rhodium-Catalyzed Sequential Cycloisomerization/Aldol Addition of Cyclopropene Carboxylic Acids with Isatins
作者:Dan Zhang、Xin Wang、Mengchu Zhang、Wenhao Hu
DOI:10.1021/acs.orglett.0c01957
日期:2020.7.17
A unique, rhodium-catalyzed reaction of cyclopropene carboxylic acids with isatins has been developed, which takes place through a trapping process of transient cyclic carboxylic oxonium ylides. This reaction tolerates a wide variety of cyclopropene carboxylic acids and N-protected or unprotected isatins and represents a new, direct strategy to access valuable γ-substituted γ-butenolide architectures
A carboxyl-assisted C–H functionalization of acrylic acids with formaldehyde to give butenolides is described. It is the first time that the addition of an inert vinylic C–H bond to formaldehyde has been achieved via cobalt-catalyzed C–H activation. The unique reactivity of the cobalt species was observed when compared with related Rh or Ir catalysts. γ-Hydroxymethylated butenolides were produced by
描述了用甲醛对丙烯酸进行羧基辅助的 C-H 官能化以得到丁烯内酯。这是首次通过钴催化的 C-H 活化将惰性乙烯基 C-H 键添加到甲醛中。与相关的 Rh 或 Ir 催化剂相比,观察到钴物种的独特反应性。γ-羟甲基化丁烯内酯是通过Na 2 CO 3在一锅催化反应后处理制备的。