Monday, June 30, 2008
Emerald Grand Ballroom (Sheraton Burlington Hotel and Conference Center)
273

Synthesis of Novel Carbohydrate Fused Macrolactams

Richard T. Desmond, W. Sean Fyvie, and Mark W. Peczuh. University of Connecticut, Storrs, CT

Natural product and natural product-like molecules that contain a macrocycle are attractive synthetic targets because they contain novel molecular architectures and they are often biologically active. Previous efforts from our group delivered carbohydrate-fused and cyclohexane diol-fused [13] macro-dilactones. These macrodilactones featured a ring fusion that contained no atoms between the bridgehead carbons. Here we report on studies investigating macrocyles that are fused at the C1 and C6 positions of a pyranose ring. The 1,6 connectivity to the carbohydrate affords a one atom bridge in the bicyclic system. Concurrently, the introduction of an amide to the macrocycle to yields a carbohydrate fused macrolactam. The new macrolactams have been produced via a concise synthetic sequence that includes acylation of a 6-amino galactose followed by glycoslyation and ring closing metathesis (RCM). Structural investigation of the new macrolactams will be followed by an assay of their biological activity.