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
Synthesis of Trihalomethyl Ketones from Trihalomethyl Carbinols (Hal = Cl, Br) Using 2-Iodoxybenzoic Acid
作者:A. Gulizhabaier、A. A. Rexit
DOI:10.1134/s1070428021050079
日期:2021.5
Abstract An efficient method for the preparation of trihalomethyl (Cl, Br) ketones by the oxidation of trihalomethyl carbinols with 2-iodoxybenzoic acid in tert-butanol under heating has been developed. A series of trihalomethyl ketones have been synthesized through a simple, convenient, and environmentally friendly method with excellent yields.
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
Selected Methods for the Oxidation of 1,1,1-Trichloro-2-alkanols. An Efficient Modification Using Chromic Acid
作者:Carlo Gallina、Cesare Giordano
DOI:10.1055/s-1989-27293
日期:——
The effectiveness of thirteen largely applied procedures has been checked in the oxidation of 1,1,1-trichloropropan-2-ol. A new, simple, and efficient modification using chromic acid has been found for the preparation of representative trichloromethyl ketones.
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