Reviving electrocatalytic reductive amination: a sustainable route from biogenic levulinic acid to 1,5-dimethyl-2-pyrrolidone
作者:Sonja D. Mürtz、Nils Kurig、F. Joschka Holzhäuser、Regina Palkovits
DOI:10.1039/d1gc02513a
日期:——
densities lower than 40 mA cm−2. The application of optimized reaction conditions to levulinicacid, followed by a short heating procedure for dehydrative ring closure, led to 1,5-dimethyl-2-pyrrolidone in 78% yield. The systematic approach of this work presents the first example of an electrochemical levulinicacidamination and provides a methodology for the benign synthesis of other N-containing species
电催化还原胺化以水为氢源和良性反应条件为含氮平台和精细化学品提供了绿色途径。然而,关于合适的反应条件和在生物底物上的应用的系统研究很少见。在这里,我们展示了乙酰丙酸到 1,5-二甲基-2-吡咯烷酮的电化学转化。来自 Smirnov等人的数据。通过系统地研究电极材料、基材浓度、电流密度、溶剂、电解质和 pH 值的影响,验证和扩展了传统酮的胺化。具有高 pH 值的水性电解质中的高底物浓度能够形成亚胺,并且在低于 40 mA cm -2 的电流密度下,铜被认为是最具选择性的阴极材料。将优化的反应条件应用于乙酰丙酸,然后进行短时间加热脱水闭环,以 78% 的产率得到 1,5-二甲基-2-吡咯烷酮。这项工作的系统方法提出了电化学乙酰丙酸胺化的第一个例子,并为其他含氮物质的良性合成提供了方法。
Characterization of three novel enzymes with imine reductase activity
作者:M. Gand、H. Müller、R. Wardenga、M. Höhne
DOI:10.1016/j.molcatb.2014.09.017
日期:2014.12
Iminereductases (IRED) are promising catalysts for the synthesis of optically pure secondary cyclic amines. Three novel IREDs from Paenibacillus elgii B69, Streptomyces ipomoeae 91-03 and Pseudomonas putida KT2440 were identified by amino acid or structural similarity search, cloned and recombinantly expressed in E. coli and their substrate scope was investigated. Besides the acceptance of cyclic