手性氟化胺的对映选择性合成在合成化学和制药工业中非常重要,但也极具挑战性。在此,我们建立了化学酶级联,通过有机酶脱羧氟化和双酶催化两个催化模块,在水-油-固体多相体系中从容易获得的β-酮酸酯对映选择性合成手性α-单胺和二氟甲基胺。还原胺化。通过分步酶固定化、双相系统构建和连续流操作,构建高效的连续合成系统,实现工艺强化。该流动系统实现了高达 19.7 g L –1 h –1的高时空产率与使用游离酶的批次系统相比,提高了 35 倍,并且还表现出较高的操作稳定性,96 小时后仍保持 87% 的生产活性,半衰期为 443.9 小时。
α-Fluorotricarbonyl Derivatives as Versatile Fluorinated Building Blocks: Synthesis of Fluoroacetophenone, Fluoroketo Ester and Fluoropyran-4-one Derivatives
作者:Antal Harsanyi、Anne Lückener、Hedvig Pasztor、Zahide Yilmaz、Lawrence Tam、Dmitry S. Yufit、Graham Sandford
DOI:10.1002/ejoc.202000503
日期:2020.7.7
Fluorinated acyl‐Meldrum’s acid derivatives were synthesised by electrophilic fluorination of appropriate phenacyl Meldrum’s acid substrates using Selectfluor. Reactions with water, ethanol, Grignard and alkynyl lithium reagents gave rise to the corresponding fluoro‐acetophenone, ‐1,3‐ketoester, ‐1,3‐diketone and ‐pyran‐4‐one products respectively from the same selectively fluorinated scaffold in one‐step
A Practical Synthesis of α-Fluoroketones in Aqueous Media by Decarboxylative Fluorination of β-Ketoacids
作者:Jian Li、Yin-Long Li、Nan Jin、Ai-Lun Ma、Ya-Nan Huang、Jun Deng
DOI:10.1002/adsc.201500282
日期:2015.8.10
A practical and novel process for the decarboxylativefluorination of β‐ketoacids in water in the presence of phase transfer catalyst has been developed, affording a series of α‐fluoroketones in good to excellent yields. Furthermore, a preliminary investigation for the catalytic asymmetric transformation was performed and a proposed mechanistic pathway for this catalytic process was proposed.
A ruthenium complex RuCl[(S,S)-Tsdpen](p-cymene) represented by a formula below and a ketone compound are placed in a polar solvent, and the resulting mixture is mixed under pressurized hydrogen to hydrogenate the ketone compound and to thereby produce an optically active alcohol:
Utilizing a multiphase reactor for the conversion of biomass to produce substituted furans
申请人:MICROMIDAS, INC.
公开号:US10093638B2
公开(公告)日:2018-10-09
The present disclosure provides methods to produce substituted furans (e.g., halomethylfurfural, hydroxymethylfurfural, and furfural), by acid-catalyzed conversion of biomass using a gaseous acid in a multiphase reactor, such as a fluidized bed reactor.