Terminal Alkenes from Acrylic Acid Derivatives via Non-Oxidative Enzymatic Decarboxylation by Ferulic Acid Decarboxylases
作者:Godwin A. Aleku、Christoph Prause、Ruth T. Bradshaw-Allen、Katharina Plasch、Silvia M. Glueck、Samuel S. Bailey、Karl A. P. Payne、David A. Parker、Kurt Faber、David Leys
DOI:10.1002/cctc.201800643
日期:2018.9.7
Fungal ferulic acid decarboxylases (FDCs) belong to the UbiD‐family of enzymes and catalyse the reversible (de)carboxylation of cinnamic acidderivatives through the use of a prenylated flavin cofactor. The latter is synthesised by the flavin prenyltransferase UbiX. Herein, we demonstrate the applicability of FDC/UbiX expressing cells for both isolated enzyme and whole‐cell biocatalysis. FDCs exhibit
A general synthesis of α-fluoroalkylphosphonates is provided by the reaction of the dialyl fluoromethyl-phosphonate carbanion with alkyl halides, aldehydes, ketones, and acyl halides.
[EN] FLUORINATION METHOD<br/>[FR] PROCÉDÉ DE FLUORATION
申请人:ISIS INNOVATION
公开号:WO2015140572A1
公开(公告)日:2015-09-24
The present invention relates to a process for producing an organic compound comprising an 18F atom. The compounds comprising an 18F can be useful as PET ligands for use in diagnostics and/or scanning. The process of the invention comprises treating an organoboron compound, which organoboron compound comprises a boron atom bonded to an sp2 hybridised carbon atom, with (i) 18F – and (ii) a copper compound. The invention also provides the use of an organoboron compound, which organoboron compound comprises a boron atom bonded to an sp2 hybridised carbon atom, in a process for producing an organic compound comprising an 18F atom, which process comprises treating the organoboron compound with (i) 18F – and (ii) a copper compound. The invention also provides a compound of formula (XXXVII): wherein: each PGA is independently H or an alcohol protecting group; PGB is H or a carboxylic acid protecting group; each PGC is independently an amine protecting group; Z is a group selected from a boronic ester group, a boronic acid group, a borate group, and a trifluoroborate group; and a is an integer from 0 to 4.
Olefination via Cu-Mediated Dehydroacylation of Unstrained Ketones
作者:Xukai Zhou、Yan Xu、Guangbin Dong
DOI:10.1021/jacs.1c09587
日期:2021.12.8
unique reaction pathway involving aromatization-driven C–C cleavage to remove the acyl moiety, followed by Cu-mediated oxidative elimination to form an alkene between the α and β carbons. The newly adopted N′-methylpicolinohydrazonamide (MPHA) reagent is key to enable efficient cleavage of ketone C–C bonds at room temperature. Diverse alkyl- and aryl-substituted olefins, dienes, and special alkenes
nucleophilic addn. of an organolithium reagent to DMF are basic enough to deprotonate alkyltriphenylphosphonium salts suspended in THF. The aldehydes, liberated by the spontaneous decompn. of the resulting a-amino alcs. (hemi-aminals), undergo a Wittig reaction with the simultaneously generated P ylides to afford olefins in excellent overall yields. This in situ method offers the unique advantage in
Li a-(二甲氨基)醇盐由亲核加成物产生。有机锂试剂对 DMF 的碱性足以使悬浮在 THF 中的烷基三苯基鏻盐去质子化。醛,由自发分解释放。产生的α-氨基醇。(半缩醛胺),与同时生成的 P 叶立德进行 Wittig 反应,以优异的总产率提供烯烃。这种原位方法在其适用于不稳定醛方面提供了独特的优势,否则这些醛将成为 (Z/E)-异构化或自缩合过程的牺牲品。[在 SciFinder (R) 上]