An improved strategy for the stereoselective synthesis of glycosides using glycosidases as catalysts
摘要:
A alternative strategy for the synthesis of glycosides, using glycosidase enzymes, has been developed. In contrast to previous procedures, this new method uses limiting amounts of the acceptor alcohol substrate in combination with an excess of the glycosyl donor. Using this procedure, a series of mono- and disaccharides have been prepared.
Herein, we report the first example of group transfer radical addition of O-vinylhydroxylamine derivatives onto unactivatedalkenes. By utilizing O-vinylhydroxylamine derivatives as both the N- and C-donors, this reaction enables intermolecular carboamination of unactivatedalkenes in an atom economical fashion. As the process is initiated through N-radical addition followed by C-transfer, linear carboamination
在此,我们报告了第一个将 O-乙烯基羟胺衍生物基团转移自由基加成到未活化烯烃上的例子。通过使用 O-乙烯基羟胺衍生物作为 N 和 C 供体,该反应能够以原子经济的方式对未活化的烯烃进行分子间碳胺化。由于该过程是通过 N-自由基加成和 C-转移引发的,因此提供了线性碳胺化产物。这与烯烃的经典自由基碳官能化不同,后者通常有利于支链产物,因为它是由 C-自由基加成引发的。
METHOD FOR PREPARING DIPEPTIDYL PEPTIDASE-IV INHIBITOR AND INTERMEDIATE
申请人:Kwak Woo Young
公开号:US20120016125A1
公开(公告)日:2012-01-19
The present invention relates to an improved method for preparing dipeptidyl peptidase-IV inhibitor and intermediate. The present invention is able to reduce preparation costs by using low cost reagents on reaction and is able to be used in mass production by improving yield.
Unnatural polar α-aminoxy acid residue with proteingenous hydroxymethyl side chain, a building block of the peptidomimetic foldamer of α-aminoxy peptide, was synthesized starting from natural amino acid L-serine. The starting material, L-serine, undergoes a reactionsequence to produce compound 1 in three steps: (1) the neighboring carboxyl group participates in diazotization/bromination to transform
Synthesis of Functionalized <i>N</i>-Acetyl Muramic Acids To Probe Bacterial Cell Wall Recycling and Biosynthesis
作者:Kristen E. DeMeester、Hai Liang、Matthew R. Jensen、Zachary S. Jones、Elizabeth A. D’Ambrosio、Samuel L. Scinto、Junhui Zhou、Catherine L. Grimes
DOI:10.1021/jacs.8b03304
日期:2018.8.1
purification strategies to access large quantities of these PG building blocks, as well as their derivatives, are challenging. A robust chemoenzymatic synthesis was developed using an expanded NAM library to produce a variety of 2 -N-functionalized UDP NAMs. In addition, a synthetic strategy to access bio-orthogonal 3-lactic acid NAM derivatives was developed. The chemoenzymatic UDP synthesis revealed that the
尿苷二磷酸 N-乙酰胞壁酸 (UDP NAM) 是细菌肽聚糖 (PG) 生物合成的关键中间体。作为塑造 PG 骨架的胞壁酸的主要来源,安装在 UDP NAM 中间体的修饰可用于通过代谢掺入选择性地标记和操纵该聚合物。然而,获取大量这些 PG 构建块及其衍生物的合成和纯化策略具有挑战性。使用扩展的 NAM 库开发了强大的化学酶合成,以产生各种 2-N-功能化的 UDP NAM。此外,还开发了一种获取生物正交 3-乳酸 NAM 衍生物的合成策略。化学酶促 UDP 合成表明,细菌细胞壁再循环酶 MurNAc/GlcNAc 异头激酶 (AmgK) 和 NAM α-1 磷酸尿苷转移酶 (MurU) 允许在糖供体的两个和三个位置进行排列。我们使用包括四嗪连接在内的各种生物正交化学进一步探索了这些衍生物在全细胞中革兰 (-) 和革兰 (+) PG 荧光标记中的效用。该报告允许快速和可扩展地访问各种功能化的
An improved strategy for the stereoselective synthesis of glycosides using glycosidases as catalysts
作者:Anne Baker、Nicholas J. Turner、Matthew C. Webberley
DOI:10.1016/s0957-4166(00)80398-5
日期:1994.12
A alternative strategy for the synthesis of glycosides, using glycosidase enzymes, has been developed. In contrast to previous procedures, this new method uses limiting amounts of the acceptor alcohol substrate in combination with an excess of the glycosyl donor. Using this procedure, a series of mono- and disaccharides have been prepared.