Oxidative iodination of carbonyl compounds using ammonium iodide and oxone®
作者:Mahender Reddy Marri、Arun Kumar Macharla、Swamy Peraka、Narender Nama
DOI:10.1016/j.tetlet.2011.09.106
日期:2011.12
A simple, efficient, mild, and regioselective method for oxyiodination of carbonyl compounds has been reported by using NH4I as the source of iodine and Oxone® as an oxidant. Various carbonyl compounds such as aralkyl ketones, aliphatic ketones (acyclic and cyclic), and β-keto esters proceeded to the respective α-monoiodinated products in moderate to excellent yields. Unsymmetrical aliphatic ketones
We report the metal-catalyzed α-hydroxylation of a variety of cyclic and acyclic β-dicarbonylcompounds by molecularoxygen. The decisive advantage of this new method is the use of catalytic amounts of the nontoxic cerium salt CeCl3·7H2O in 2-propanol at ambient temperature. Most of the cyclic substrates 4a−4i give high yields of analytically pure products 5a−5i, and the workup procedure is simple
Synthesis of 2-Hydroxy-3-oxocarboxylic Esters From the Corresponding α,β-Unsaturated Esters by a Simple One-Step Procedure
作者:D. H. G. Crout、D. L. Rathbone
DOI:10.1055/s-1989-27142
日期:——
A convenient one-step synthesis of 2-alkyl-2-hydroxy-3-oxocarboxylic esters by potassium permanganate oxidation of the corresponding readily available α,β-unsaturated esters is described. Preparation of the latter by the phosphonate modification of the Wittig reaction is also reported.
CROUT, D. H. G.;RATHBONE, D. L., SYNTHESIS,(1989) N, C. 40-42
作者:CROUT, D. H. G.、RATHBONE, D. L.
DOI:——
日期:——
Practical formal total synthesis of (rac)- and (S)-camptothecin
作者:René Peters、Martin Althaus、Anne-Laure Nagy
DOI:10.1039/b514147h
日期:——
A practical, efficient and scalable formaltotalsynthesis of (rac)- and (S)-camptothecin is described, which proceeds via the known DE ring building blocks 19 and (S)-19, respectively. The racemic synthesis starts from diethyl oxalate and uses straightforward carbonyl chemistry in order to generate the pyridone ring system. 19 was formed in 8.4% overall yield over 9 linear steps avoiding any chromatographic