、 alkaline earth salt of/the/ methylsulfuric acid 以51%的产率得到4-methoxybenzyl O-(5-acetamido-3,5-dideoxy-α-D-glycero-D-galacto-2-nonulopyranosylonic acid)-(2-3)-O-β-D-galactopyranosyl-(1-3)-2-acetamido-2-deoxy-β-D-glucopyranoside
参考文献:
名称:
The use of porcine liver (2 → 3)-α-sialyltransferase in the large-scale synthesis of α-Neup5Ac-(2 → 3)-β-d-Galp-(1 → 3)-d-GlcpNAc, the epitope of the tumor-associated carbohydrate antigen CA 50
摘要:
Alpha-Neup5Ac-(2 --> 3)-beta-D-Galp-(1 --> 3)-D-GlcpNAc (2) and, alpha-Neup5Ac-(2 --> 3)-beta-D-Galp-(1 --> 3)-beta-D-GalpNAcOMBn were prepared on a large scale by the action of beta-D-Galp-(1 --> 3)-D-GalpNAc (2 --> 3)-alpha-sialyltransferase (partially purified from porcine liver) on beta-D-Galp-(1 --> 3)-D-GlcpNAc and beta-D-Galp-(1 --> 3)-beta-D-GlcpNAcOMBn, respectively. The trisaccharide 2 is the epitope of the tumor-associated carbohydrate antigen CA 50, highly expressed in human pancreatic adenocarcinoma.