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.
ABSTRACT An efficient and widely applicable oxidation method of tribromomethyl carbinols in the presence of pyridinium chlorochromate has been developed with excellent yields up to 96%. This method was well applied for the oxidation of a variety of aromatic, aliphatic, and heterocyclic tribromomethyl carbinols. GRAPHICAL ABSTRACT
A NOVEL METHOD FOR THE SYNTHESIS OF 2,2,2-TRIBROMOETHANOLS FROM ALDEHYDES AND CARBONTETRABROMIDE IN THE PRESENCE OF STANNOUS FLUORIDE —A SYNTHESIS OF DIACETYL-D-ERYTHRONOLACTONE—
In the presence of stannous fluoride, 2,2,2-tribromoethanols are conveniently prepared fromaldehydes and carbontetrabromide under a mild reaction condition. The reaction is efficiently applied to the synthesis of 2,3-diacetyl-D-erythronolactone starting from 2,3-O-isopropylidene-D-glyceraldehyde.
Diethylzinc‐Mediated Cross‐Coupling Reactions between Dibromoketones and Monobromo Carbonyl Compounds
作者:Aika Takeshima、Taichi Kano
DOI:10.1002/anie.202217496
日期:2023.2.13
Chiral 1,4-dicarbonyl compounds can be obtained via the enantioselective bromination of aldehydes and subsequent cross-coupling reactionsbetween the resulting chiral α-bromoaldehydes and α,α-dibromoketones. This cross-coupling reaction is enabled by the chemoselective formation of zinc enolates from α,α-dibromoketones in the presence of α-bromocarbonyl compounds.
reports the synthesis of cyclobutene derivatives in good yields via the [2 + 2] cycloaddition between lithium ynolates and α,β-unsaturated carbonyls. The ynolates are generated fromα,α,α-tribromomethyl ketones and tert-butyl lithium via a simple and novel method, which does not produce any harmful byproducts, such as lithium alkoxide, which induces a polymerization reaction with α,β-unsaturated carbonyls