Development of an<i>R</i>-Selective Amine Oxidase with Broad Substrate Specificity and High Enantioselectivity
作者:Rachel S. Heath、Marta Pontini、Beatrice Bechi、Nicholas J. Turner
DOI:10.1002/cctc.201301008
日期:2014.4
Amine oxidases are useful bio‐catalysts for the synthesis of enantiomerically pure 1°, 2° and 3° chiral amines. Enzymes in this class (e.g., MAO‐N from Aspergillus niger) reported previously have been shown to be highly S selective. Herein we report the development of an enantiocomplementary R‐selective amine oxidase based on 6‐hydroxy‐D‐nicotine oxidase (6‐HDNO) with broadened substrate scope and
A Methyl Scan of the Pyrrolidinium Ring of Nicotine Reveals Significant Differences in Its Interactions with <i>α</i>7 and <i>α</i>4<i>β</i>2 Nicotinic Acetylcholine Receptors
作者:Hong Xing、Kristin W. Andrud、Ferenc Soti、Anne Rouchaud、Stephan C. Jahn、Ziang Lu、Yeh-Hyon Cho、Sophia Habibi、Patrick Corsino、Svetoslav Slavov、James R. Rocca、Jon M. Lindstrom、Ron J. Lukas、William R. Kem
DOI:10.1124/mol.119.118786
日期:2020.8
with α4β2 but not α7receptors. The 2'-methylation uniquely enhanced binding and agonist potency at α7receptors. Although 3'- and 5'-trans-methylations were much better tolerated by α7receptors than α4β2receptors, 4'-methylation decreased potency and efficacy at α7receptors much more than at α4β2receptors. Whereas cis-5'-methylnicotine lacked agonist activity and displayed a low affinity at both
Formation of N′-ethyl-S-nornicotine by transformed root cultures of Nicotiana rustica
作者:Henry D. Boswell、Allan B. Watson、Nicholas J. Walton、David J. Robins
DOI:10.1016/s0031-9422(00)90797-0
日期:1993.8
N-Ethylputrescine dihydrochloride has been synthesized by an improved procedure and it is converted by transformed root cultures of Nicotiana rustica into the nicotine analogue, N'-ethyl-S-nornicotine, preferentially in the optically active S-form, with an efficiency similar to that of the corresponding natural process.
v. Braun; Weissbach, Chemische Berichte, 1930, vol. 63, p. 2018,2026
作者:v. Braun、Weissbach
DOI:——
日期:——
Highly Enantioselective Borane Reduction of Heteroaryl and Heterocyclic Ketoxime Ethers Catalyzed by Novel Spiroborate Ester Derived from Diphenylvalinol: Application to the Synthesis of Nicotine Analogues
作者:Kun Huang、Francisco G. Merced、Margarita Ortiz-Marciales、Héctor J. Meléndez、Wildeliz Correa、Melvin De Jesús
DOI:10.1021/jo800204n
日期:2008.6.1
An asymmetric synthesis for the preparation of nonracemic amines bearing heterocyclic and heteroaromatic rings is described. A variety of important enantiopure thionyl and arylalkyl primary amines were afforded by the borane-mediated enantioselective reduction of O-benzyl ketoximes using 10% of catalyst 10 derived from (S)-diphenylvalinol and ethylene glycol with excellent enantioselectivity, in up
描述了制备带有杂环和杂芳环的非外消旋胺的不对称合成。使用 10%衍生自 ( S )-二苯基缬氨醇和乙二醇的催化剂10 ,通过硼烷介导的对映选择性还原O-苄基酮肟,得到各种重要的对映纯亚硫酰基和芳烷基伯胺,具有优异的对映选择性,高达 99% ee 。首次不对称还原 3- 和 4-吡啶基衍生的O-苄基酮肟醚的最佳条件是在 10 °C 下在二恶烷中使用 30% 的催化负载量实现的。( S ) -N-乙基降烟碱 ( 3 ) 也由 TIPS 保护的 ( S )-2-氨基-2-吡啶乙醇在 97% ee 中成功合成。