Lipid A and related compounds. XXVI. Syntheses of biologically active penta-O-acetyl-N-glycoloylneuraminyl- and penta-O-acetyl-3-deoxy-D-glycero-D-galacto-2-nonulopyranosonic acid-(α 2 → 6)-D-glucosamine-4-phosphate analogs of lipid A
The syntheses of novel penta-O-acetyl-N-glycoloylneuraminyl- and penta-O-acetyl-3-deoxy-n-glycero-D-galacto-2-nonulopyranosonic acid-(α 2 → 6)-D-glucosamine-4-phosphate analogues of lipid A containing sialic acid in place of 3-deoxy-D-manno-2-octulosonic acid are described. Preliminary examination of the biological activity revealed that two synthetic disaccharides showed mitogenic activities and weak antitumor activities.