Synthesis and enzyme-inhibitory activity of methyl acarviosin analogues having the α- manno configuration
摘要:
Two methyl acarviosin analogues 3a and 4a, having the alpha-manno configuration, and their dihydro derivatives 6a and 7a were synthesised by coupling the protected pseudo-sugar epoxides with methyl 4-amino-4-deoxy- and -4,6-dideoxy-alpha-D-mannopyranoside. Similarly, two analogous compounds 5a and 8a composed of the 1,6-anhydro-beta-D-mannopyranose residues were prepared. Compound 7a showed mild inhibitory activity against Jack bean alpha-D-mannosidase, and 3a was a moderate inhibitor of both alpha-D-mannosidase and yeast alpha-D-glucosidase.
已经合成了被甲酸,乙酸或(S)-2,4-二羟基丁酸N-酰化的4-氨基-4,6-二脱氧-D-甘露吡喃糖(过胺)的甲基α-糖苷。的1 H和13 C ^这些物质和亲本的NMR谱,非Ñ -acylated糖苷,演示了如何将化学位移是由影响Ñ酰化。所述Ñ发生在两种构象,仲-甲酰基衍生物的顺式和S-反,和它们之间的自由能屏障,86.9千焦摩尔-1,通过动态核磁共振谱定义。