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...
.alpha.-Amino aldehyde equivalents as substrates for rabbit muscle aldolase: synthesis of 1,4-dideoxy-D-arabinitol and 2(R),5(R)-bis(hydroxymethyl)-3(R),4(R)-dihydroxypyrrolidine
作者:Rebecca R. Hung、Julie Ann Straub、George M. Whitesides
DOI:10.1021/jo00012a015
日期:1991.6
This work examined the application of rabbit muscle aldolase (RAMA) to stereospecific carbon-carbon bond formation in the preparation of carbohydrates containing amino groups. Several alpha-amino aldehyde equivalents were evaluated as substrates for RAMA and for their synthetic utility in transformations following the aldol reaction. This methodology is illustrated by the syntheses of the pyrrolidine alkaloids 1,4-dideoxy-D-arabinitol and 2(R),5(R)-bis(hydroxymethyl)-3(R), 4(R)-dihydroxypyrrolidine. The kinetic resolution of racemic aldehydes by RAMA and mild methods for transforming the amino equivalents into the desired amines are discussed briefly.
Synthesis of a novel α-glucoside of the powerful glucosidase inhibitor 2,5-dideoxy-2,5-imino-d-mannitol via enzymatic glucosylation of 5-azido-5-deoxy-d-fructopyranose
作者:Karl Dax、Michael Ebner、Roland Peinsipp、Arnold E. Stütz
DOI:10.1016/s0040-4039(96)02281-2
日期:1997.1
Regio- and stereoselective enzymatic glucosylation of 5-azido-5-deoxy-D-fructopyranose with the aid of commerically available alpha-glucosidase from yeast allows easy access to the corresponding 4-O-alpha-D-glucopyranosyl derivative of this non-natural ketose. This disaccharide gives, in one step, access to 2,5-dideoxy-3-O-alpha-D-glucopyranosyl-2,5-imino-D-mannitol. Copyright (C) 1996 Elsevier Science Ltd
Nickel(II)-Catalysed Transformations of 5-Azido-5-deoxy-<scp>d</scp>-glucofuranose and of 5-Azido-5-deoxy-<scp>l</scp>-idofuranose
作者:Philipp Hadwiger、Andreas Lechner、Arnold E. Stütz
DOI:10.1080/07328309808002325
日期:1998.3.1
Nickel(II) catalysed isomerisation reactions of C-5 modified derivatives of D-glucose as well as L-idose were investigated. 5-Azido-5-deoxy-D-glucofuranose was successfully isomerised into the corresponding D-manno epimer in good yields. Contrasting this result, in the case of the 5-modified L-idofuranose probed, no evidence for successful epimerisation at C-2 could be found. However, this sugar was quantitatively rearranged into the corresponding L-sorbopyranose. Upon extended reaction periods, the latter underwent degradation to give the coresponding 4-modified methyl L-xylonate.
2,5-dideoxy-2,5-imino-d-mannitol and -d-glucitol. Two-step bio-organic syntheses from 5-azido-5-deoxy-d-glucofuranose and -l-idofuranose; evaluation as glucosidase inhibitors and application in affinity purification and characterisation of invertase from yeast
作者:Günter Legler、Annette Korth、Andreas Berger、Christian Ekhart、Günther Gradnig、Arnold E. Stütz
DOI:10.1016/0008-6215(93)84155-y
日期:1993.12
5-dideoxy-2,5-imino- d -glucitol ( 5 ). This represents a preparatively very simple and efficient two-step synthesis of these biologically active compounds. Both are strong inhibitors of α- and β-glucosidases from various sources, the d - manno -isomer 4 being distinctly more active. Because of its structural relationship with β- d -fructofuranose, compound 4 is also a very good inhibitor of invertase from