Heterocyclisation of free or partially protected alditols via their bis-cyclic sulfate derivatives. Versatile synthesis of aza and thiodeoxyanhydroalditol with erythro, threo, arabino, gulo, talo or manno configuration
摘要:
The bis-cyclic sulfate derivatives of erythritol (1), D,L-threitol (5), 3,4-di-O-benzyl-D-mannitol (9), 1,2-O-isopropylidene-D-mannitol (14) and 1-O-benzyl-D,L-xylitol (18) were submitted to nucleophilic attack by allylamine or sodium sulfide. In both cases, heterocyclisation occurred and aza or thioanhydrodeoxyalditols were obtained in moderate to good yields (40 to 89%). With compound 9, 1,5-anhydro-5-thio-L-gulitol (12) was obtained as the main product, a result that is in contrast with previous results reported in the literature using bis-epoxide as bielectrophile intermediate.(1) (C) 2000 Published by Elsevier Science Ltd.
Versatile synthesis of some analogues of the naturally-occurring α-glucosidase inhibitor salacinol (1), involving thioanhydro alditol moieties with erythro, d,l-threo, xylo, ribo, d-arabino and d-manno configurations is described. Nucleophilic attack at the least-hindered carbon atom of an l- or d-protected erythritol cyclic sulfate by the thioanhydro alditol sulfur atom yielded the desired zwitterionic
多功能天然存在的α葡萄糖苷酶抑制剂的Salacinol(的一些类似物的合成1),涉及thioanhydro糖醇部分具有赤式,d,1-苏式,木糖,核糖,D-阿糖和D-甘露配置进行说明。硫代脱水醛糖醇硫原子对1-或d-保护的赤藓糖醇环状硫酸盐的最少受阻碳原子的亲核攻击产生了所需的两性离子化合物。此外,2,4-的环硫酸酯的制备ø -亚苄基- d赤藓糖醇和2,4- ö-异亚丙基-1-赤藓糖醇得到改善。酶抑制试验表明,大多数新化合物是弱的但特异性抑制剂,而六元环类似物(β-葡萄糖苷酶:K i = 16μM)则具有良好的抑制活性。
Provided herein are heterocyclic compounds and pharmaceutical compositions comprising said compounds that are useful for inhibiting the growth of gram-negative bacteria. The subject compounds and compositions are useful for the treatment of bacterial infections, such as pneumonia.
Hydrogen Bonding-Assisted Enhancement of the Reaction Rate and Selectivity in the Kinetic Resolution of <i>d,l</i>
-1,2-Diols with Chiral Nucleophilic Catalysts
作者:Kazuki Fujii、Koichi Mitsudo、Hiroki Mandai、Seiji Suga
DOI:10.1002/adsc.201700057
日期:2017.8.17
An extremely efficient acylative kineticresolution of d,l‐1,2‐diols in the presence of only 0.5 mol% of binaphthyl‐based chiral N,N‐4‐dimethylaminopyridine was developed (selectivityfactor of up to 180). Several key experiments revealed that hydrogen bonding between the tert‐alcohol unit(s) of the catalyst and the 1,2‐diol unit of the substrate is critical for accelerating the rate of monoacylation
Heterocyclisation of free or partially protected alditols via their bis-cyclic sulfate derivatives. Versatile synthesis of aza and thiodeoxyanhydroalditol with erythro, threo, arabino, gulo, talo or manno configuration
The bis-cyclic sulfate derivatives of erythritol (1), D,L-threitol (5), 3,4-di-O-benzyl-D-mannitol (9), 1,2-O-isopropylidene-D-mannitol (14) and 1-O-benzyl-D,L-xylitol (18) were submitted to nucleophilic attack by allylamine or sodium sulfide. In both cases, heterocyclisation occurred and aza or thioanhydrodeoxyalditols were obtained in moderate to good yields (40 to 89%). With compound 9, 1,5-anhydro-5-thio-L-gulitol (12) was obtained as the main product, a result that is in contrast with previous results reported in the literature using bis-epoxide as bielectrophile intermediate.(1) (C) 2000 Published by Elsevier Science Ltd.