An efficient one-pot synthesis of a library of novel sugar-based
spirooxindole-pyrrolidines or -pyrrolizidines has been accomplished
by [3+2] cycloaddition. This method utilizes
an azomethine ylide derived from isatin and sarcosine
or l-proline with an α,β-unsaturated β-C-glycosidic ketone as the dipolarophile.
All these sugar-based heterocyclics were characterized by NMR (¹H and ¹³C),
HPLC, and elemental analysis
4,6-O-butylidene-d-glucopyranose - α,β-unsaturated β-C-glycosidic
ketones - cycloaddition - azomethine ylide - monospiroheterocyclics