Fine regioselective tuning in the oxidation of sec,sec 1,2-diols by dimethyldioxirane
作者:Paolo Bovicelli、Anna Sanetti、Paolo Lupattelli
DOI:10.1016/0040-4020(96)00615-1
日期:1996.8
Non symmetric sec,sec 1.2-diols and their O-isopropylidene derivatives undergo a regioselectiveoxidation by dimethyldioxirane depending on the electronic effects of the substituents. These results support previous views about the concerted -insertion mechanism via a polar transition state.
One-Pot Catalytic Synthesis of 2-(1,2-Dihydroxypropyl)phenol Derivatives from 2-Allylphenols in Aqueous Media
作者:Jean Le Bras、Carole Chevrin、Françoise Hénin、Jacques Muzart
DOI:10.1055/s-2005-872175
日期:——
Catalytic amounts of the hydrophilic ligand [(HOCH2CH2NHCOCH2)2NCH2]2 and palladium(II) salts, in the presence of hydrogen peroxide, water and alcohol, allow the direct transformation of 2-allylphenols into 2-(1,2-dihydroxypropyl)phenol derivatives. The mechanism involves sequential isomerisation, epoxidation, and oxirane-opening.
Mechanistic Insights into the Palladium<sup>II</sup>-Catalyzed Hydroxyalkoxylation of 2-Allylphenols
作者:Emilie Thiery、Carole Chevrin、Jean Le Bras、Dominique Harakat、Jacques Muzart
DOI:10.1021/jo062491x
日期:2007.3.1
oxidation of o-allylphenol with H2O2 in water/methanol affords a syn and anti mixture of 2-(1,2-dihydroxypropyl)phenol and 2-(2-hydroxy-1-methoxypropyl)phenol. Mechanistic experiments and ESI-MS studies support a pathway wherein isomerization of the CC bond followed by its epoxidation and oxirane opening led to the products. Recycling of the catalytic system led to gradual lost of activity.