据报道,由3,4,6-三-O-苄基-d-葡糖醛4立体合成了两个多羟基吡咯烷的非对映异构体,涉及裂解-再循环策略。半缩醛7从己烯糖得到4上LiAlH,在还原4,得到二醇8。选择性乙酰化8至11,然后Mitsunobu环化产生了多种保护的聚羟基吡咯烷12。氧化11和随后的立体选择性还原导致20中,C-5差向异构体的11,其在光延环化,得到polyhydroxypyrrolidine21。使用在MeOH中的Na 2 CO 3对12和21的乙酰基进行选择性脱保护。与过量的Mg的MeOH一起加热时,聚羟基吡咯烷12和21同时进行N-脱甲苯基化和脱乙酰化,以定量收率分别得到氨基醇15和24。15和24的催化氢化分别定量地提供了多羟基吡咯烷2和3。
Chemoenzymatic Preparation of Novel Cyclic Imine Sugars and Rapid Biological Activity Evaluation Using Electrospray Mass Spectrometry and Kinetic Analysis
作者:Shuichi Takayama、Richard Martin、Jiangyue Wu、Karen Laslo、Gary Siuzdak、Chi-Huey Wong
DOI:10.1021/ja971695f
日期:1997.9.1
and since imines are key intermediates in a variety of cycloadditions, condensations, and nucleophilicadditions, they are valuable as versatile syntheticintermediates for the preparation of novel iminocyclitols and derivatives. An example of such syntheticutility is demonstrated by the synthesis of amino-iminocyclitol 24 via a three-center, two-component Strecker reaction. A novel method for rapidly
环状亚胺糖是通过一种新的化学酶促策略制备的,其中通过酶促醛醇反应构建的叠氮糖在酸性条件下氢化。发现这些环状亚胺糖是糖加工酶的有效抑制剂,这些酶对多种糖苷酶的 Ki 值在纳摩尔和微摩尔范围内。与它们完全氢化的对应物相比,环状亚胺糖通常对所测试的糖苷酶表现出相当或更好的抑制作用。由于这些环状亚胺很容易获得,并且由于亚胺是各种环加成、缩合和亲核加成的关键中间体,因此它们作为用于制备新型亚氨基环醇和衍生物的通用合成中间体是有价值的。通过三中心、两组分 Strecker 反应合成氨基-亚氨基环醇 24 证明了这种合成效用的一个例子。一种使用电喷雾快速筛选糖苷酶抑制剂的新方法...
Strategy for designing selective α-l-rhamnosidase inhibitors: Synthesis and biological evaluation of l-DMDP cyclic isothioureas
α-l-rhamnosidase; it also caused broad inhibition spectrum against β-glucosidase and β-galactosidase. In contrast, the corresponding N-benzyl-l-DMDP cyclic isothioureas display selective inhibition of α-l-rhamnosidase; 3',4'-dichlorobenzyl-l-DMDP cyclic isothiourea (3r) was found to display the most potent and selective inhibition of α-l-rhamnosidase, with IC50 value of 0.22μM, about 46-fold better
Synthesis of azasugars as potent inhibitors of glycosidases
作者:Yves Le Merrer、Lydie Poitout、Jean-Claude Depezay、Isabelle Dosbaa、Sabine Geoffroy、Marie-José Foglietti
DOI:10.1016/s0968-0896(96)00266-0
日期:1997.3
A series of enantiomerically pure azasugars (2,5-dideoxy-2, 5-imino-D-mannitol, 1-deoxynojirimycin, 1-deoxymannojirimycin, and related compounds) was synthesized from D-mannitol via aminoheterocyclization of C2-symmetric bis-epoxides and subsequently followed by ring isomerization in few cases. These compounds have been evaluated as inhibitors of several glycosidases (alpha- and beta-D-glucosidases
Synthesis of azasugars. Part 1 isomerization of polyhydroxylated piperidines
作者:Lydie Poitout、Yves Le Merrer、Jean-Claude Depezay
DOI:10.1016/0040-4039(96)00096-2
日期:1996.3
and l-gulitol undergo easy isomerization, mainly either by ring contraction, or either by SN2 inversion at C2. This isomerization performed by bis-hydroxyl activation allows to access to 2,5-dideoxy-2,5-imino-l-iditol, 5-epi-DNJ, DMDP, and DMJ.
Short-step synthesis of chiral C2-symmetric 2,3,4,5-tetrasubstituted pyrrolidines from D-mannitol and their use as chiral ligands in the reaction of diethylzinc and benzaldehyde
rolidine and related chiral C2-Symmetric pyrrolidines including D2-symmetric 1,2-bis(1-pyrrolidino)-ethanes and N-hydroxyethylpyrrolidines were synthesized highly practically from D-mannitol and a high chiral induction of 82% ee was observed in investigation of efficiency of these amines as chiral catalyst ligands in the addition reaction of diethylzinc to benzaldehyde.