Synthesis and biological activity of bi/tricyclic azasugars fused thiazolidin-4-one and thiazinan-4-one by microwave-assisted tandem Staudinger/aza-Wittig/cyclization
作者:Xiaoliu Li、Zhanbin Qin、Tianyu Yang、Hongzhi Zhang、Sinan Wei、Chunxiao Li、Hua Chen、Ming Meng
DOI:10.1016/j.bmcl.2012.02.103
日期:2012.4
A convenient synthesis of novel bi/tricyclic azasugars fused thiazolidin-4-one and thiazinan-4-one by the one-pot tandem Staudinger/aza-Wittig/cyclization reaction under microwave radiation was demonstrated. The reactions were carried out with the azidosugar 1 and mercaptan acids via a key intermediate Schiff base and stereoselectively afforded the titled bi/tricyclic azasugars in good yield. All the
通过一锅串联的Staudinger / aza-Wittig /环化反应在微波辐射下方便地合成了融合了噻唑烷定-4-酮和噻嗪南-4-酮的新型双/三环氮杂糖。反应是通过关键的中间席夫碱与叠氮糖1和硫醇酸一起进行的,并以高收率立体选择性地提供了标题的双/三环氮杂糖。所有主要产物均为1,2-反式,反应的立体选择性主要取决于C-2,3上相邻的刚性环状异亚丙基的空间位阻,这有利于硫原子的外攻击(在硫醇酸中) )到中间亚胺。化合物10的初步生物学评估–图17表明,发现化合物10b,11a,12b,14b,16b,17a和17b显着地激活了自然杀伤(NK)细胞(免疫增强活性),化合物10a,10b,12a,16b和17b表现出弱的抑制活性。抗β-葡萄糖苷酶。然而,这些测试化合物均未对T细胞增殖产生明显影响,也未显示出对α-淀粉酶和α-葡萄糖苷酶的抑制作用。