Efficient synthesis of 1β-O-acyl glucuronides via selective acylation of allyl or benzyl d-glucuronate
作者:Elizabeth R. Bowkett、John R. Harding、James L. Maggs、B. Kevin Park、Jennifer A. Perrie、Andrew V. Stachulski
DOI:10.1016/j.tet.2007.05.050
日期:2007.8
Acyl glucuronides are key metabolites for many carboxylic acid-containing drugs, notably those of the non-steroidal anti-inflammatory class. In the processes of drug safety assessment and new drug development, it is essential that acyl glucuronides, if formed in vivo, should be made conveniently available for bioevaluation. We recently showed that selective acylation of allyl glucuronate is a promising method for the synthesis of these metabolites in good yield and with excellent beta-anomeric selectivity. We now give fuller details of the allyl ester method and further report that benzyl glucuronate performs at least equally well in the acylation step, offering the advantage of very mild deprotection by catalytic transfer (or conventional) hydrogenation. Depending on the compatibility of other functional groups, as discussed below, this will be the method of choice for many acyl glucuronide syntheses. The value of the method is demonstrated in particular by the synthesis of several acyl glucuronides that are known metabolites of important drugs. (C) 2007 Elsevier Ltd. All rights reserved.
Convenient syntheses of the in vivo carbohydrate metabolites of mycophenolic acid: reactivity of the acyl glucuronide
作者:Amy E. Jones、Helen K. Wilson、Paul Meath、Xiaoli Meng、David W. Holt、Atholl Johnston、Michael Oellerich、Victor W. Armstrong、Andrew V. Stachulski
DOI:10.1016/j.tetlet.2009.06.060
日期:2009.9
Following in vivo use of mycophenolic acid, the O-aryl and O-acyl glucuronides, as well as the recently discovered O-aryl glucoside (Scheme 1), are all found as metabolites. We describe convenient preparations of all three derivatives. The phenolic glycosides are obtained by phase-transfer-catalysed alkylation of methyl mycophenolate in very high yield, as an excellent alternative to the Königs-Knorr