Regioselective Oxygenations of S-Trans Dienes, Silyl Dienol Ethers (SDEs), by Triphenyl Phosphite Ozonide (TPPO) and Its Mechanistic Study

Stereoselective Photooxidation of Enecarbamates: Reactivity of Ozone vs Singlet Oxygen

[reaction: see text]. Oxazolidinone-functionalized enecarbamates show contrasting behavior upon oxidation by singlet oxygen and by ozone. The observed stereoselectivity difference indicates that the oxidation with ozone is subject to classic steric effects, whereas the very high selectivity in the photooxidation with singlet oxygen is derived from vibrational deactivation.

First one-pot copper-catalyzed synthesis of alpha-hydroxy-beta-amino acids in water. A new protocol for preparation of optically active norstatines

Alpha-hydroxy-beta-amino acids were synthesized with excellent yields for the first time in water and by a simple procedure based on a copper catalytic cycle, which included the recovery and reuse of the catalyst and is possible to realize by using only water as reaction medium.

Bromolysis and iodolysis of alpha,beta-epoxycarboxylic acids in water catalyzed by indium halides

The ring opening of alpha,beta-epoxycarboxylic acids by bromide and iodide ions has been efficiently carried out in water in high regio- and stereoselective fashion. The iodolysis of trans-beta-monoalkylated epoxycarboxylic acids at pH 4.0 was completely alpha-regioselective and anti diastereoselective. The InCl(3)-catalyzed iodolysis of a variety of alpha,beta-epoxycarboxylic acids at pH 1.5 gave the corresponding anti beta-iodohydrins in 88-95% yields. The one-pot synthesis of the alpha- and beta-hydroxyhexanoic acids, starting from the corresponding alpha,beta-epoxycarboxylic acid 1a by iodolysis followed by reduction of the resulting iodohydrins 4a and 4b by NaBH(4)-InCl(3) in water, has been performed.