Chelation-controlled regioselectivity in the lanthanum-promoted monobenzoylation of monosaccharides in water
作者:Ian James Gray、Ronald Kluger
DOI:10.1016/j.carres.2007.05.024
日期:2007.10
formation of the ester, which competes with hydrolysis of BzMP, to give an estimate of the efficiency of the conversion of the sugar. Higher conversions can be achieved using excess reagent. Regioselectivity is influenced by the structure of the glycoside. For example, the reaction leads to different product distributions from alpha- and beta-anomers of the glycosides. The reaction combination provides a
Magnesium ion enhances lanthanum-promoted monobenzoylation of a monosaccharide in water
作者:Raj S. Dhiman、Ronald Kluger
DOI:10.1039/b926851k
日期:——
Magnesium ion combines selectively with the methyl phosphate by-product in the lanthanum-promoted biomimetic reaction of benzoyl methyl phosphate with monosaccharides.
have studied the acyl migration in different monosaccharides using five different acylgroups by a combination of experimental, kinetic and theoretical tools. The results show that the anomeric configuration in the monosaccharide has a major influence on the migration rate, together with the relative configurations of the other hydroxylgroups and the nature of the migrating acylgroup. Full mechanistic