626-56-2Relevant articles and documents
Method for preparing piperidine compound by reducing pyridine compound through hydrogen transfer
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Paragraph 0022; 0023; 0024; 0025; 0026, (2021/04/28)
The invention discloses a method for preparing a piperazine compound through a hydrogen transfer reduction of a pyridine compound, belonging to the field of organic synthesis. Under mild conditions, pyridine derivatives are used as raw materials, oxazolidine is used as a hydrogen transfer reagent, and cheap transition metals such as copper, cobalt, silver, palladium and the like are used as catalysts for catalysis of a hydrogen transfer reaction on 1,2,3,4-substitution sites, so a series of hydrogen transfer reduction product piperidine compounds are prepared, wherein the oxazaborolidine is obtained by a reaction of amino acid with a tetrahydrofuran complex of borane. The method has the advantages that product yield is high, reaction conditions are mild, the general applicability of raw materials is good, a hydrogen transfer reagent is cheap and easy to obtain, and good reproducibility can still be shown after quantitative reaction is conudcted. Therefore, the method of the invention provides an effective scheme for the industrial production of other high-value compounds containing the structure in the future.
Powering Artificial Enzymatic Cascades with Electrical Energy
Al-Shameri, Ammar,Apfel, Ulf-Peter,Lauterbach, Lars,Nestl, Bettina M.,Petrich, Marie-Christine,junge Puring, Kai
supporting information, p. 10929 - 10933 (2020/05/04)
We have developed a scalable platform that employs electrolysis for an in vitro synthetic enzymatic cascade in a continuous flow reactor. Both H2 and O2 were produced by electrolysis and transferred through a gas-permeable membrane into the flow system. The membrane enabled the separation of the electrolyte from the biocatalysts in the flow system, where H2 and O2 served as electron mediators for the biocatalysts. We demonstrate the production of methylated N-heterocycles from diamines with up to 99 percent product formation as well as excellent regioselective labeling with stable isotopes. Our platform can be applied for a broad panel of oxidoreductases to exploit electrical energy for the synthesis of fine chemicals.
Cascade Biotransformation to Access 3-Methylpiperidine in Whole Cells
Borlinghaus, Niels,Weinmann, Leonie,Krimpzer, Florian,Scheller, Philipp N.,Al-Shameri, Ammar,Lauterbach, Lars,Coquel, Anne-Sophie,Lattemann, Claus,Hauer, Bernhard,Nestl, Bettina M.
, p. 5738 - 5742 (2019/07/16)
Synthesis of 3-methylpiperidine from 1,5-diamino-2-methylpentane in preparative scale is reported by using recombinant Escherichia coli cells expressing a variant of the diamine oxidase from Rhodococcus erythroprolis and an imine reductase from Streptosporangium roseum. Optimization of process parameters for cultivation and bioconversion led to substantial improvements in the initial laboratory procedure. The transformation of the methyl-substituted diamine substrate to the N-heterocyclic product was successfully scaled-up from shake-flask to a 20 L bioreactor with increased substrate concentrations. Remarkably, we obtained 67 % of 3-methylpiperidine product from 140 g substrate within 52 h.
