1-(Chloromethyl)-4-fluoro-1,4-diazoniabicyclo-[2,2,2]octane Bis(tetrafluoroborate) as Novel and Efficient Reagent for the Conjugate Addition of Indoles to α,β-Unsaturated Ketones
Highly effective and regioselective Michael addition of indoles to α,β-unsaturated ketones promoted by pentafluorophenylammonium triflate
作者:Samad Khaksar、Seyed Mohammad Vahdat、Fatemeh Rezaee
DOI:10.1016/j.crci.2012.08.002
日期:2013.2
Abstract A simple, inexpensive, environmentally friendly and efficient route for Michaeladdition of indoles to α,β-unsaturated ketones using pentafluorophenylammonium triflate (PFPAT) as a catalyst is described. Various indole derivatives were synthesized in good to excellent yields. The preparation of PFPAT catalyst from simple and readily available starting materials makes this method more affordable
Air-stable μ2-hydroxyl bridged cationic binuclear complexes of zirconocene perfluorooctanesulfonates: their structures, characterization and application
binuclear structures: (i) [CpZr(OH2)3]2(μ2-OH)2(OSO2C8F17)4·2THF·4H2O (1a·2THF·4H2O), (ii) [n-BuCpZr(OH2)3]2(μ2-OH)2(OSO2C8F17)4·6H2O (2a·6H2O), and (iii) [t-BuCpZr(OH2)3]2(μ2-OH)2(OSO2C8F17)4·2C3H6O·8H2O (3a·2C3H6O·8H2O). The ligands of water and organic molecules in the complexes originated from the moist air and solvent during their recrystallization. These complexes were characterized with different
1-(Chloromethyl)-4-fluoro-1,4-diazoniabicyclo-[2,2,2]octane Bis(tetrafluoroborate) as Novel and Efficient Reagent for the Conjugate Addition of Indoles to α,β-Unsaturated Ketones
作者:J. S. Yadav、B. V. Subba Reddy、A. Raju、K. Ravindar、Gakul Baishya
DOI:10.1246/cl.2007.1056
日期:2007.8.5
Indoles undergo smooth conjugate addition with α,β-unsaturated ketones in the presence of 10 mol % SelectfluorTM under extremely mild conditions to afford the corresponding Michael adducts in high to quantitative yields with 1,4-selectivity.