A Practical and General Synthesis of Unsymmetrical Terphenyls
摘要:
[GRAPHICS]A synthetic procedure was developed that enables sequential chemoselective Suzuki-Miyaura cross-coupling of chlorobromobenzene with arylboronic acids. The first coupling is achieved at room temperature using a ligandless palladium catalyst. The chlorobiaryl product can then be subjected directly to the second coupling, facilitated by the SPhos ligand. Using this methodology, parallel synthesis of 32 unsymmetrical o-, m-, and p-terphenyl compounds was accomplished in good to excellent overall yields.
Visible-Light-Promoted, Catalyst-Free Gomberg–Bachmann Reaction: Synthesis of Biaryls
作者:Juyoung Lee、Boseok Hong、Anna Lee
DOI:10.1021/acs.joc.9b00557
日期:2019.7.19
Biaryls were synthesized via a novel visible-light-promoted Gomberg–Bachmann reaction that does not require a photosensitizer or any metal reagents. The formation of an electron donor–acceptor complex between aryl diazonium salts and pyridine allows, under visible-light irradiation, the synthesis of biaryls in moderate-to-high yields.
The atom-efficient cross-couplingreaction of sodium tetraarylborates with aryl iodides and bromides was reported. The reaction can be performed directly using a catalytic system composed of palladium chloride, sodium carbonate and methanol (PdCl2/Na2CO3/MeOH) under heat-free conditions at room temperature in an open air conditions. The reactions carried out in an atom-efficient way as 4 equiv of aryl
报道了四芳基硼酸钠与芳基碘化物和溴化物的原子有效的交叉偶联反应。该反应可以使用由氯化钯,碳酸钠和甲醇(PdCl 2 / Na 2 CO 3 / MeOH)组成的催化体系,在无热条件下,在室温,露天条件下直接进行。该反应以原子有效的方式进行,如4当量的芳基卤化物与1当量的四芳基硼酸钠有效偶联,以良好至优异的产率提供4当量的相应的官能化联芳基。
[EN] NOVEL ANTI-INFECTIVE COMPOUNDS AND METHODS USING SAME<br/>[FR] NOUVEAUX COMPOSÉS ANTI-INFECTIEUX ET LEURS MÉTHODES D'UTILISATION
申请人:UNIV PENNSYLVANIA
公开号:WO2016077541A1
公开(公告)日:2016-05-19
The present invention includes a method of treating or preventing a bacterial infection in a subject in need thereof. The method comprises administering to the subject a therapeutically effective amount of at least one compound of the invention. In certain embodiments, the bacterium is Gram-negative. In other embodiments, the bacterium is obligatory aerobic.
Fe(OTf)(3)-1,10-phenanthroline catalyzes oxidative coupling of arylboronic acids with benzene derivatives using t-BuOOt-Bu as an oxidant. The reaction proceeds through homolytic aromatic substitution with aryl radicals generated from arylboronic acids and t-BuO .
A rapid, atom-efficient, cross-couplingreaction of triarylbismuths with aryl bromides or aryl iodides was reported, and the reaction involves the use of a catalytic amount of polystyrene-supported palladium in the presence of KF as base in DMSO at 105 °C in an open atmosphere. All three aryl groups of the triarylbismuths participated in the reaction and produced polyfunctional biaryls in excellent
据报道,三芳基铋与芳基溴化物或芳基碘化物发生快速、原子效率高的交叉偶联反应,该反应涉及使用催化量的聚苯乙烯负载的钯,在 105 °C 的 DMSO 中以 KF 作为碱存在在开放的气氛中。三芳基铋的所有三个芳基都参与了反应并以优异的产率生成了多官能联芳基化合物。聚合物催化剂可以很容易地从反应混合物中分离出来,并且可以重复使用 10 次以上,而没有表现出任何明显的活性下降。