A chemoselective oxidation of monosubstituted ethylene glycol: facile synthesis of optically active α-hydroxy acids
作者:Kiran Chinthapally、Sundarababu Baskaran
DOI:10.1039/c4ob00601a
日期:——
A mild and efficient method for the synthesis of optically active α-hydroxy acids through chemoselective oxidation of monosubstitutedethylene glycols using the TEMPO–NaOCl reagent system is described. It is evident from our studies that the solvent, pH and reaction temperature are very crucial for the success of this oxidation. The versatility of this method has been demonstrated with a variety of
Regioselective reduction of 3-substituted-2,3-epoxy alcohols to 1,3-diols with sodiumbis(2-methoxyethoxy)aluminumhydride (Red-al) is shown to be a general reaction for these substitutes.
Chemoselective catalytic oxidation from 1,2-diols to a-hydroxy acids in a cat. TEMPO/cat. NaOCl/NaClO2 system has been achieved. The use of a two-phase condition consisting of hydrophobic toluene and water suppresses the concomitant oxidative cleavage. A study of the mechanism suggests that the observed selectivity is derived from the precise solubility: control of diols and hydroxy acids as well as the active species Of TEMPO, Although the oxoammonium species TEMPO+Cl- is hydrophilic, the active species dissolves into the organic layer by the formation of the charge-transfer (CT) complex TEMPO-ClO2 under the reaction conditions.
Colonge; Gaumont, Bulletin de la Societe Chimique de France, 1959, p. 939,941
作者:Colonge、Gaumont
DOI:——
日期:——
Beasley et al., Journal of Pharmacy and Pharmacology, 1959, vol. 11, p. 36,41