Efficient Synthesis of Functionalized Indene Derivatives via Rh(III)‐Catalyzed Cascade Reaction between Oxadiazoles and Allylic Alcohols
作者:Jing Zhang、Jun‐Shu Sun、Ying‐Qi Xia、Lin Dong
DOI:10.1002/adsc.201801606
日期:2019.4.23
A highly efficient rhodium(III)‐catalyzedsynthesis of novel functionalized indene derivatives has been achieved via C−H activation/intramolecular aldol condensation. This cascade reaction is an atom economical protocol which could be further applied to build more complexcompounds.
The introduction of electronegative substituents onto the silyl group of triaryl(2-silylethylidene)phosphorane promotes eliminative silyl migration relative to the Wittig reaction; the combination of this effect with modification of the phosphorane substituents leads to highly diastereoselective reagents for alkenylation.
Ruthenium- and rhodium-catalyzed oxidative couplings between versatile directed aromatic C–H bonds and allylicalcohols have been achieved. This method provides efficient synthesis of functional β-aryl ketones and aldehydes in good to excellent yields, and the carbonyl group in the desired products was a significant synthon for organic synthesis.
Versatile directed aromatic C–H bond activation and oxidative coupling with allylicalcohols is reported using a cationic Rh(III) catalyst. This method provides efficient and robust synthesis of functional β-aryl ketones and indolines in good yields with excellent regioselectivity, even the reaction runs at 3 g scale. The catalytic systems have good functional group tolerance, such as CONR2, NHAc,
A Rh(III)‐catalyzed Csp2−Csp3 bondcleavage/carbonylethylation of α‐indolylalcohols with allylic alcohols has been reported. This transformation involved a cascade C−C bondcleavage/C−C bond formation, and provides a novel approach to assemble 2‐carbonylethylindole skeletons.