A process for preparing an a-keto acid ester (oxo acid) of the formula:
wherein R1 is a hydrogen atom, aliphatic alkyl group of 1-6 carbon atoms, phenyl group or benzyl group, and R2 is an aliphatic alkyl group of 1-6 carbon atoms, which comprises causing an a-hydroxycarboxylic acid ester of the formula:
to react with molecular oxygen in a gaseous phase in the presence of copper phosphate, possibly, mounted on a solid carrier.
An investigation of structure-reactivity relationships of δ-alkenyl oximes; competitive thermal reactions leading to cyclic nitrones and/or N-unsubstituted bicyclic isoxazolidines
作者:Linda Doyle、Frances Heaney
DOI:10.1016/j.tet.2010.06.005
日期:2010.8
Thermal reactions of C-aryl δ-alkenyl oximes give N-unsubstituted bicylic lactone, lactam and pyrrolidine fusedisoxazolidines by an intramolecular oxime olefin cycloaddition pathway (IOOC) and/or cyclic nitrones by an azaprotio cyclotransfer (APT) route; a number of factors, including the nature of the aryl group, the oxime geometry and the structure of the linker between the oxime and the terminal