Synthesisvia a Carbohydrate-DerivedM�nchnone of Pyrrolopyridines (Indolizines) and imidazopyridines, and their evaluation as inhibitors of ?-D-glucosidases
In the presence of activating agents, the N-acylglycine 8 reacts with electrophilic alkynes via the münchnone9 to the pyrrolopyridines (= indolizines) 10, 18, and 19 (Scheme 1 ), Depending on the nature of the activating agent and the reaction temperature, the formation of the pyrroles was accompanied by partial epimerization to the manna-configurated epimers 16 and 17. The gluco-configurated pyrrolopyridine