fun: The synthetic potential of the highly regio‐ and stereoselective title reaction, which relies on two oxidativecleavage steps promoted by RuCl3 in combination with NaIO4 (see example; Bz=benzoyl), was demonstrated with the synthesis of biologically active cis‐(2R,3S)‐3‐hydroxypipecolic acid from D‐glucose.
2,4,4,6-Tetrabromo-2,5-cyclohexadienone (TABCO) as a Versatile, Efficient, and Chemoselective Catalyst for the Acetalization and Transacetalization of Carbonyl Compounds, the Preparation of Acetonides from Epoxides and Acylals (1,1-Diacetates) from Aldehydes
The efficient and chemoselective preparation of acetals and ketals from carbonyl compounds, transacetalization reactions, the conversion of epoxides to acetonides, and the preparation of acylals from aldehydes in the presence of catalytic amounts of 2,4,4,6-tetrabromo-2,5-cyclohexadienone (TABCO) are described.
study of various metal trifluoromethanesulfonates as efficient catalysts in the regioselectivereductiveringopening of benzylidene acetals is described, including the effects of solvents, reducing agents, and temperature. These catalysts are found to be effective in cleaving the 4,6‐O‐acetalrings of hexopyranosides at either O4 or O6, respectively. When used in conjunction with a 1 M solution of
Oxidative transformation of 1,3-dioxacycloalkanes induced by chlorine dioxide
作者:A. R. Abdrakhmanova、N. N. Kabal’nova、L. Z. Rol’nik、G. G. Yagafarova、V. V. Shereshovets
DOI:10.1007/s11172-005-0030-0
日期:2004.8
The products and kinetic regularities of the reactions of 1,3-dioxacycloalkanes with chlorine dioxide were studied. The effects of the nature of solvent and the temperature on the reaction rate were considered and the activation parameters were determined.
Facile oxidative cleavage of benzylidene acetals using molecular oxygen catalyzed by N -hydroxyphthalimide/Co(OAc) 2
作者:Yongsheng Chen、Peng George Wang
DOI:10.1016/s0040-4039(01)00905-4
日期:2001.7
Benzylidene acetals derived from 1,2- and 1,3-diols undergo facile oxidative cleavage to give hydroxy benzoate esters with molecularoxygen in the presence of catalytic amount of N-hydroxyphthalimide/Co(OAc)2.