Analogues of Sialic Acids as Potential Sialidase Inhibitors. Synthesis of C<sub>6</sub>and C<sub>7</sub>Analogues of<i>N</i>-Acetyl-6-amino-2,6-dideoxyneuraminic Acid
作者:Brigitte I. Glänzer、Zoltan Györgydeák、Bruno Bernet、Andrea Vasella
DOI:10.1002/hlca.19910740214
日期:1991.3.13
The piperidines 12–18, piperidmose analogues of Neu5Ac (1) with a shortened side chain, were synthesized from N-acetyl-D-glucosamine via the azidoalkene 32 and tested as inhibitors of Vibrio cholerae sialidase. Deoxygenation at C(4) of the uronate 22, obtained from the known D-GlcNAc derivative 20, was effected by β-elimination ( 23), exchange of the AcO at C(3) with a (t-Bu)Me2SiO group and hydrogenation
哌啶12 – 18(具有较短侧链的Neu5Ac(1)的哌啶类似物)是由N-乙酰基-D-葡萄糖胺通过叠氮基烯烃32合成的,并已作为霍乱弧菌唾液酸酶的抑制剂进行了测试。从已知的D-GlcNAc衍生物20中获得的尿酸盐22在C(4)处的脱氧作用是通过β-消除(23),在C(3)处的AcO与(t- Bu)Me 2 SiO交换来实现的。基团和氢化(26;方案1)。扩链26通过与Me 3 SiCH 2 MgCl反应,得到D-氨基-二羟基硅烷28,它被转化为不饱和的L-二甲苯基甲磺酸酯29,进而转化为L-二甲苯基醇30,甲磺酸酯31和L-二甲苯基-叠氮化物32。派生词29 – 31更喜欢镰刀状之字形,而32主要是扩展之字形构型(图2)。哌啶羧酸盐15是由32进行臭氧分解制得的(33),分子内还原性动画(34)和脱保护,而34与乙醇醛的还原性动画(35)和脱保护得到16(方案2)。分子内的叠氮化物-烯烃环