Highly dispersed Co in porous N-doped carbon is active for oxidation of the C–H bond to ketones under 60 °C and 1 atm O2, which is 41.3 times more active in comparison to ZIF-67-derived Co catalyst.
Three-Component, Stereoselective Palladium-Catalyzed Synthesis of Functionalized Bicyclopentanoids
作者:Bernard Hulin、Linda S. Newton、Shawn Cabral、Aaron J. Walker、Jon Bordner
DOI:10.1021/ol048140r
日期:2004.11.1
1,5-Cyclooctadiene can be stereoselectively transformed into a substituted bicyclo[3.3.0]octane ring system under palladium catalysis with concomitant formation of three carbon-carbon bonds. Reaction with an aryl iodide or triflate and malonate gives an exo-endo product, while the reaction with a malonate in the presence of oxygen affords a bis-endo adduct.
Intramolecular Iron(II)-catalyzed Nitrogen Transfer Reactions of Unsaturated Alkoxycarbonyl Azides: A Facile and Stereoselective Route to 4,5-Disubstituted Oxazolidinones
Intramolecular FeII-catalyzed reactions of various unsaturated alkoxycarbonyl azides are described. The reactions occur in the presence of stoichiometric amounts of trimethyl silyl chloride employing ethanol as the solvent. The corresponding 2-alkenyloxycarbonyl azides 5, 9, 18, 20, 22, and 24 gave the products 7/8, 10/11, 19, 21, 23, and 25 of an olefin chloroamination in moderate to good yields (47-72%)
Tricyclic oxonium-directed addition: Regiochemistry and stereochemistry of the iodination reactions in 2,3-epoxy cyclooct-5-en-1-ols and 2,3-epoxy-5-en-1-one.
作者:Eleuterio Alvarez、M. Teresa Díaz、Matías L. Rodríguez、Julio D. Martín.
DOI:10.1016/0040-4039(90)80035-k
日期:1990.1
The transannular O-heterocyclization of 9-oxabicyclo[6.1.0] non-4-en-2-ols and 9-oxabicyclo[6.1.0] non-4-en-2-one by iodine-assisted oxirane ring expansion was studied. The stereo- and regioselectivity for the[4.2.1] vs[3.3.1] 10-oxabicyclo nonane skeletons are studied in terms of a tricyclic oxonium ion intermediate and rationalized by means of MNDO calculations.
研究了碘辅助的环氧乙烷环扩展对9-氧杂双环[6.1.0]非-4-烯-2-醇和9-氧杂双环[6.1.0]非-4-烯-2-酮的跨环O-杂环化作用。用三环氧离子中间体研究了[4.2.1] vs [3.3.1] 10-氧杂双环壬烷骨架的立体选择性和区域选择性,并通过MNDO计算对其进行了合理化。