A facile access to indene frameworks through condensation of substituted cinnamylaldehydes and sulfonylamines under the catalysis of FeCl3 is reported.
通过FeCl3催化下,报告了通过取代的肉桂醛和磺酰胺的缩合轻松获得茚骨架。
S<sub>N</sub>2″-Selective and Enantioselective Substitution with Unsaturated Organoboron Compounds and Catalyzed by a Sulfonate-Containing NHC-Cu Complex
作者:Yuebiao Zhou、Ying Shi、Sebastian Torker、Amir H. Hoveyda
DOI:10.1021/jacs.8b10885
日期:2018.12.5
53-89% yield, 69-96% SN2″ selectivity, 98:2 to >98:2 E: Z ratio, and 94:6-98:2 er. Insight regarding several of the unique mechanistic attributes of the catalytic process was obtained on the basis of kinetic isotope effect measurements and DFT studies. These investigations indicate that cationic π-allyl-Cu complexes are likely intermediates, clarifying the role of the s-cis and s-trans conformers of
Conversion of 2-Alkylcinnamaldehydes to 2-Alkylindanones via a Catalytic Intramolecular Friedel−Crafts Reaction
作者:Gary B. Womack、John G. Angeles、Vincent E. Fanelli、Christie A. Heyer
DOI:10.1021/jo070952o
日期:2007.8.31
3-arylpropanoic acids or halides requires the use of noncatalytic acid promoters. In the presence of 5−10 mol % FeCl3, in situ generated dimethyl acetals of (E)-2-alkylcinnamaldehydes cyclize to 1-methoxy-2-alkyl-1H-indenes in good-to-high yields. The 1-methoxyindenes were converted in high yield into 2-alkylindanones by treatment with triethylamine, to effect isomerization to the isomeric enol ethers
Diastereoselective addition of methylmetal reagents to 2-methylaldehydes
作者:Michael Larsson、Hans-Erik Högberg
DOI:10.1016/s0040-4020(01)00713-x
日期:2001.8
3-hydroxy-2-methyl-1-butyl moiety of high diastereomeric purity is described. These compounds can serve as potential building blocks for the preparation of several kinds of natural products. The diastereoselectiveaddition of a number of methylmetal derivatives to three 3-substituted 2-methylaldehydes in various solvents was studied. An excellent diastereomeric ratio (95:5 anti-Cram/Cram) was obtained with