Kinetics and Mechanisms of Vinpocetine Degradation in Aqueous Solutions
作者:Nouman Muhammad、Gloria Adams、Hyuk-Koo Lee
DOI:10.1002/jps.2600770207
日期:1988.2
of degradation is 1----4 in equilibrium 5. The kinetics for the degradation of 1 in the pH 1-3 region is represented by a consecutivereaction with a reversible step (second-order), but the degradation of 1 in the pH 3.5-6.0 region follows pseudo first-order kinetics. Significant buffer catalysis is observed with acetate and phosphate buffers. Reactions are dependent on the ionic strength, pH, and temperature
Abstract A one-pot synthesis of vinpocetine from vincamine was established. Lewis acids caused transesterification and/or dehydration of vincamine in EtOH. FeCl3 catalyzed both transesterification and dehydration while Ti(OEt)4 selectively catalyzed transesterification.