A novel β-(oxy)alkyl radical during copper(I)-mediated stereoselective synthesis of (Z)-ene-1,4-diones in a reaction of 2,2,2-trichloro-1-phenylethanone
作者:Ram N. Ram、Ram K. Tittal
DOI:10.1016/j.tetlet.2016.04.080
日期:2016.6
novel β-(oxy)alkyl radical derived from trichloro methyl compound containing neither a suitably located C–C multiple bond nor a leaving group or a H-atom at the β-position of the radical in a reaction of 2,2,2-trichloro-1-phenyl-ethanone with 2 mol equiv each of CuCl and bpy in refluxing DCE under a N2 atm underwent intramolecular heterolysis (just like formation of intact radical cation–anion pair)
Copper(I)-Promoted Synthesis of Chloromethyl Ketones from Trichloromethyl Carbinols
作者:Ram N. Ram、T. P. Manoj
DOI:10.1021/jo8007644
日期:2008.7.1
Reaction of several trichloromethyl carbinols with 2 equiv of CuCl/bpy in refluxing DCE for 3 h afforded chloromethyl ketones in excellent yield by 1,2-H shift in the copper-chlorocarbenoid intermediate.
β-(Carbonatoxy)alkyl radicals: a new subset of β-(ester)alkyl radical fragmentation during copper(I)-mediated synthesis of 1,1-dichloro-1-alkenes
作者:Ram N. Ram、Ram K. Tittal
DOI:10.1016/j.tetlet.2014.05.097
日期:2014.7
A new subset of β-(ester)alkyl radicals is presented. It is the first study on the chemistry of β-(alkoxycarbonyloxy)alkyl radicals that fill the gap in the spectrum of the migrating groups in β-(ester)alkyl radical reactions. The change from less nucleofugal (acetate) group to the more nucleofugal (carbonate) group in the spectrum of the migrating group changed the reaction path from rearrangement
Copper(I)/Ligand-Catalyzed 5-<i>endo</i> Radical Cyclization–Aromatization of 2,2,2-Trichloroethyl Vinyl Ethers: Synthesis of 2,3-Difunctionalized 4-Chlorofurans
作者:Ram N. Ram、Dharmendra Kumar Gupta、Vineet Kumar Soni
DOI:10.1021/acs.joc.5b02830
日期:2016.2.19
Copper(I)/ligand-catalyzed one pot synthesis of highly substituted 2,3-difunctionalized-4-chlorofurans has been reported. The reaction proceeds via a Cu(I)-catalyzed regioselective 5-endo-trig radical cyclization of 2,2,2-trichloroethyl vinyl ethers followed by the base-promoted dehydrochlorination. The success of the kinetically disfavored 5-endo cyclization was attributed to the formation of captodatively
Decarboxylative Trichloromethylation of Aromatic Aldehydes and Its Applications in Continuous Flow
作者:Andreas B. Jensen、Anders T. Lindhardt
DOI:10.1021/jo402595r
日期:2014.2.7
Two new protocols for the efficient synthesis of 2,2,2-trichloromethylcarbinols, starting from aromatic aldehydes, have been developed. A combination of sodium trichloroacetate in the presence of malonic acid proved efficient for the transformation of electron deficient aldehydes using DMSO as solvent. Electron-rich aldehydes did, however, not require the addition of malonic acid, affording the desired