Reductive Carbonylation of Acetylenes under Water-Gas Shift Reaction Conditions. Synthethis of Furan-2(5H)-ones from Terminal and Non-substituted Acetylenes
Under water-gas reaction conditions terminal and non-substituted acetylenes are selectively converted into furan-2(5H)-ones by catalysis with a rhodium carbonyl cluster.
在水-气反应条件下,末端和未取代的乙炔通过羰基铑簇的催化选择性转化为呋喃-2(5H)-酮。
Gold-Catalyzed Cascade Oxidative Cyclization and Arylation of Allenoates
作者:Rui Zhang、Qin Xu、Kai Chen、Peng Gu、Min Shi
DOI:10.1002/ejoc.201300896
日期:2013.11
was found to be effective for the cascadeoxidativearylation and cyclization of allenoates with arylboronic acids to give the corresponding cyclic adducts in moderate yields. This reaction system constitutes a new method for the synthesis of β-aryl-γ-butenolides under mild conditions. Based on the previous mechanistic studies, a proposed AuI/AuIII redox catalytic cycle has been outlined.
A Palladium-Catalyzed Synthesis of 4-Aryl-2-oxo-2,5-dihydrofurans [4-Aryl-2(5<i>H</i>)-furanones]
作者:Pier Giuseppe Ciattini、Giorgio Ortar
DOI:10.1055/s-1986-31482
日期:——
Palladium-catalyzed arylation of methyl (E)-4-(2-tetrahydropyranyloxy)-2-butenoate with aryl iodides and intramolecular cyclocondensation of the resultant 3-aryl derivatives affords 4-aryl-2-oxo-2,5-dihydrofurans in moderate to good yields.
The highly efficient Rh/ZhaoPhos-catalysed asymmetrichydrogenation of γ-butenolides and γ-hydroxybutenolides was successfully developed. This protocol provides an efficient and practical approach to the synthesis of various chiral γ-butyrolactones, which are synthetically valuable building blocks of diverse natural products and therapeutic substances, with excellent results (up to >99% conversion