N-Bromosuccinimide promoted and base switchable one pot synthesis of α-imido and α-amino ketones from styrenes
作者:Mahesh H. Shinde、Umesh A. Kshirsagar
DOI:10.1039/c5ob02034d
日期:——
N-Bromosuccinimide (NBS) promoted one pot strategy for the synthesis of α-amino functionalized aryl ketones starting from commercially available styrenes has been developed. NBS participates in multiple tasks, such as bromonium ion formation, oxidation of bromohydrin and providing a nucleophilic nitrogen source. The reaction can easily be switched between α-imido and α-amino ketones by the choice of base
A facile transformation of alkynes into α-amino ketones by an N-bromosuccinimide-mediated one-pot strategy
作者:Ting Wei、Yongming Zeng、Wei He、Lili Geng、Liang Hong
DOI:10.1016/j.cclet.2018.03.031
日期:2019.2
Abstract A faciletransformation of alkynes into α-amino ketones by an N-bromosuccinimide-mediated one-pot cascade strategy is described. A variety of α-amino ketones are obtained in moderate to good yields under mild conditions. To overcome the multi-step synthesis, N-bromosuccinimide is involved in multiple tasks, playing a key role in the reaction course.
Stereoselective Synthesis of 2-Aminocyclobutanols via Photocyclization of α-Amido Alkylaryl Ketones: Mechanistic Implications for the Norrish/Yang Reaction
作者:Axel G. Griesbeck、Heike Heckroth
DOI:10.1021/ja0111941
日期:2002.1.1
diastereospecificity was observed for the isoleucine derivatives (2S,3S)-1g and allo-(2S,3R)-1g; the Yang reaction dominated the photochemistry of allo-1g, whereas 1ggave preferentially Norrish II cleavage. The role of hydrogen bonding as one of the stereodirecting effects was demonstrated by comparison of the cyclization efficiency of the valine derivative 1e with 1h,i,j. Also, aromatic beta-keto esters
一系列手性 N-酰化 α-氨基对甲基丁酰苯衍生物 1a-1h 是通过三步程序从 α-氨基酸合成的。这些底物在苯中光解,得到 Norrish II 和 Norrish I 裂解产物以及 N-酰化的 2-氨基环丁醇,它们源自 γ-氢提取和 1,4-三重双自由基组合(阳环化)。形成具有特征杨/裂解比的产物。N-乙酰基保护底物 1b、e、f 光分解的量子产率适中 (12-26%);对于所有底物,环丁醇形成的非对映选择性都非常高。对异亮氨酸衍生物 (2S,3S)-1g 和同种异体-(2S,3R)-1g 观察到高非对映特异性;阳反应主导了allo-1g的光化学,而 1ggave 优先进行 Norrish II 裂解。通过比较缬氨酸衍生物 1e 与 1h,i,j 的环化效率,证明了氢键作为立体定向效应之一的作用。此外,芳族 β-酮酯以低产率得到阳环化产物。环丁醇形成的非对映选择性通过三步机制合理化,其中
[EN] A METAL FREE PROCESS FOR THE PREPARATION OF ALPHA-SUBSTITUTED CARBONYL COMPOUNDS FROM ALKENES<br/>[FR] PROCÉDÉ SANS MÉTAL POUR LA PRÉPARATION DE COMPOSÉS DE CARBONYLE ALPHA-SUBSTITUÉS À PARTIR D'ALCÈNES
申请人:COUNCIL SCIENT IND RES
公开号:WO2017077550A1
公开(公告)日:2017-05-11
The present invention discloses a novel metal free process for the regioselective synthesis of α-substituted carbonyl compounds of formula I from alkene, X is selected from the following compounds (A, B).
The development of a fast and oxidative coupling cum difunctionalisation reaction enables the benign synthesis of valuable α-substituted ketones from alkynes, as well as the direct synthesis of the psychoactive drug cathinone.