Synthesis of functionalized cyclotriveratrylene analogues with C1-symmetry and the application for 1,4-Michael addition of alcohols to unsaturated aryl ketone
作者:Jing-Ru Song、Zhi-Tang Huang、Qi-Yu Zheng
DOI:10.1016/j.tet.2013.06.077
日期:2013.9
the selectively demethylated compound 1. Through the chemical resolution, a pair of enantiomers of C1-symmeric compound 1 could be separated with gram scale. Compound 8, which possessed an N-linked imidazolium unit at the upper rim of the macrocyclic skeleton through a methylene linker, was successfully applied to 1,4-Michael addition reaction of alcohol to unsaturated aryl ketone. Its supramolecular
One-Pot Enol Silane Formation-Mukaiyama Aldol-Type Addition to Dimethyl Acetals Mediated by TMSOTf
作者:C. Wade Downey、Miles W. Johnson、Kathryn J. Tracy
DOI:10.1021/jo8001084
日期:2008.4.1
Various ketones, esters, amides, and thioesters add in high yield to dimethyl acetals in the presence of silyl trifluoromethanesulfonates and an amine base. Acetals derived from aryl, unsaturated, and aliphatic aldehydes are all effective substrates. The reaction proceeds in a single reaction flask, with no purification of the intermediate enolsilane necessary.
Bismuth Trichloride as a New Efficient Catalyst in the Aldol Reaction and the Michael Reaction
作者:Makoto Wada、Eiji Takeichi、Takashi Matsumoto
DOI:10.1246/bcsj.64.990
日期:1991.3
In the presence of a catalytic amount of bismuth(III) trichloride (5 mol%), silyl enol ethers react with aldehydes at room temperature in dichloromethane to give the corresponding aldols in good yields. Silyl enol ethers also have been found to react with α,β-unsaturated ketones at room temperature in dichloromethane to afford the corresponding 1,5-dicarbonyl compounds, the Michael adducts in good
MnO2-Catalyzed Oxidative Alkylation of Enamides with Ethers via C(sp3)–H/C(sp2)–H Cross-Dehydrogenative Coupling and Hydrolysis Sequence
作者:Xiangsheng Xu、Zhiyan Hu、Yucai Tang、Shan Zhang、Xiaoqing Li、Xiaohua Du
DOI:10.1055/s-0035-1560180
日期:——
A new MnO2-catalyzed oxidative alkylation of enamides with a C(sp3)–H bond adjacent to an oxygen atom is described. This method achieves a C(sp3)-H/C(sp2)-H cross-dehydrogenative coupling and hydrolysis, thus providing efficient and general access to a variety of β-oxo ketones.
A copper-catalyzed decarboxylative oxidative coupling of α,β-unsaturatedcarboxylicacids with non-cyclic ethers is developed. This method provides a new approach for C(sp3)–H bond functionalization of non-cyclic ethers. Mechanism study shows the reaction involves a radical process.