Rhodium(<scp>i</scp>)-catalyzed Pauson–Khand-type reaction using formic acid as a CO surrogate: an alternative approach for indirect CO<sub>2</sub> utilization
作者:Xian-Dong Lang、Fei You、Xing He、Yi-Chen Yu、Liang-Nian He
DOI:10.1039/c8gc03933j
日期:——
(PK-type) reaction of various substituted 1,6-enynes to afford bicyclic cyclopentenones in moderate to good yields. High TON value of up to 263 and good results in the gram-scale experiment were also obtained, demonstrating the efficacy of this methodology. In addition, heterocyclic molecules of pharmaceutical importance were also furnished via inter- or intra-molecular hetero-PK-type reactions, further
Direct allenol-based stereocontrolled access to substituted (E)-1,3-enynes
作者:Benito Alcaide、Pedro Almendros、Teresa Martínez del Campo
DOI:10.1039/c2ob26085a
日期:——
A stereoselective synthesis of 1-substituted (E)-2-aryl-but-1-en-3-ynes, including tetrasubstituted alkenes, has been developed from aryl-substituted α-allenols by treatment with the AcCl–NaOH (aqueous) system. This transformation might be explained through the elimination of acetic acid, made up of a δ-hydrogen and the acetate group in the initially formed α-allenic acetate.
Chemoselectivity Switching in the Rhodium-Catalyzed Reactions of 4-Substituted-1-sulfonyl-1,2,3-triazoles with Allenols: Noticeable Differences between 4-Acyl- and 4-Aryl-Triazoles
作者:Benito Alcaide、Pedro Almendros、Israel Fernández、Teresa Martínez del Campo、Guillermo Palop、Mireia Toledano-Pinedo、Patricia Delgado-Martínez
DOI:10.1002/adsc.201801424
日期:2019.3.5
Tunable chemoselectivity (O‐ versus C‐attack) in the rhodium‐catalyzed reactions of allenols with 4‐substituted‐1‐sulfonyl‐1,2,3‐triazoles has been achieved through the replacement of the 4‐aryl substituent by a 4‐acetyl moiety.
[EN] NITROIMIDAZOOXAZINES AND THEIR USES IN ANTI-TUBERCULAR THERAPY<br/>[FR] NITROIMIDAZOOXAZINES ET LEURS UTILISATIONS EN THÉRAPIE ANTITUBERCULEUSE
申请人:GLOBAL ALLIANCE FOR TB DRUG DEV
公开号:WO2011014774A1
公开(公告)日:2011-02-03
The present invention relates to novel nitroimidazooxazines, to their preparation, and to their use as drugs for treating Mycobacterium tuberculosis and other microbial infections, either alone or in combination with other anti-infective treatments.
Triynes having a phenylene‐bridged 1,5‐diyne moiety were transformed into substituted tetraphenylenes by the title sequence. A cationic Rh–ligand species catalyzed this highly enantioselective reaction. This protocol is a new and easy approach to the construction of the tetraphenylene skeleton and enables an efficient asymmetric synthesis (see scheme; R=H; Z=NTs, C(CO2Me)2, O).
具有亚苯基桥接的1,5-二炔部分的三炔通过标题序列转化为取代的四亚苯基。阳离子Rh-配体物种催化了这种高度对映选择性的反应。该协议是一种构造四亚苯基骨架的新方法,可轻松实现高效的不对称合成(请参见方案; R = H; Z = NTs,C(CO 2 Me)2,O)。