Integrated Electro‐Biocatalysis for Amine Alkylation with Alcohols
作者:Itziar Peñafiel、Robert A. W. Dryfe、Nicholas J. Turner、Michael F. Greaney
DOI:10.1002/cctc.202001757
日期:2021.2.5
combined process offers a new approach to amine alkylation with native alcohols, a key bond formation in the chemical economy that is currently achieved via precious metal‐catalyzed hydrogen‐borrowing technologies. The electrobio transformation is effective for primary and secondary alcohols undergoing coupling with allyl, propargyl, benzyl, and cyclopropyl amines, and has been adapted for use with solid‐supported
Basic alumina efficiently promotes the reaction of propargylamines with scCO2 for the synthesis of variously substituted oxazolidinones that, after catalyst filtration, are easily isolated by methanol crystallization.
Ag-Catalyzed or Ag/PPh<sub>3</sub>-Catalyzed Chemoselective Switchable Cascade Reactions of <i>N</i>-Propargyl Thiocarbamoyl Fluorides and Malonate Esters
作者:Zhongliang Cai、Junyi Zhou、Miao Yu、Liqin Jiang
DOI:10.1021/acs.orglett.1c03950
日期:2022.1.14
The divergent chemoselective synthesis of 2-methylene-2,3-dihydrothiazoles and 4-benzylidene pyrrolidine-2-thiones (most with E stereoselectivity) from N-propargyl thiocarbamoyl fluorides and malonate esters in moderate to excellent yields with a broad substrate scope and functional group tolerance has been accomplished. AgNTf2 catalyst at 60 °C in dichloroethane provided 4-benzylidene pyrrolidine-2-thiones
从N-炔丙基硫代氨基甲酰氟和丙二酸酯以中等至优异的产率,具有广泛的底物范围和功能性,不同的化学选择性合成 2-亚甲基-2,3-二氢噻唑和 4-亚苄基吡咯烷-2-硫酮(大多数具有 E 立体选择性)群体容忍度已经完成。AgNTf 2催化剂在 60 °C 下在二氯乙烷中提供 4-亚苄基吡咯烷-2-硫酮。AgOTf 催化剂和 PPh 3配体在回流乙腈中导致形成的 α,α-二酯硫代酰胺中间体的反应性发生完全转换,随后异构化得到 2-亚甲基-2,3-二氢噻唑。
Direct Alkylation of Amines with Primary and Secondary Alcohols through Biocatalytic Hydrogen Borrowing
作者:Sarah L. Montgomery、Juan Mangas-Sanchez、Matthew P. Thompson、Godwin A. Aleku、Beatriz Dominguez、Nicholas J. Turner
DOI:10.1002/anie.201705848
日期:2017.8.21
The reductive aminase from Aspergillus oryzae (AspRedAm) was combined with a single alcohol dehydrogenase (either metagenomic ADH‐150, an ADH from Sphingobium yanoikuyae (SyADH), or a variant of the ADH from Thermoanaerobacter ethanolicus (TeSADH W110A)) in a redox‐neutral cascade for the biocatalytic alkylation of amines using primary and secondary alcohols. Aliphatic and aromatic secondary amines
A Practical Guide for Buffer-Assisted Isolation and Purification of Primary, Secondary, and Tertiary Amine Derivatives from Their Mixture
作者:Guoxiang Ma、Amitabh Jha
DOI:10.1021/op050126m
日期:2005.11.1
A number of reactions involving primaryamines such as N-alkylation, reductive amination, Mannich reaction, etc. produce mixtures of primary, secondary, and tertiaryamines. The isolation and purification of individual constituents of these mixtures is often carried out by column chromatography or fractional distillation. For an industrial large-scale process, it would be desirable to avoid column