CX (X=Br, I) Bond-Tolerant Aerobic Oxidative Cross- Coupling: A Strategy to Selectively Construct β-Aryl Ketones and Aldehydes
作者:Mao Chen、Jie Wang、Ziyi Chai、Cai You、Aiwen Lei
DOI:10.1002/adsc.201100782
日期:2012.2
aryl halide-containing β-aryl ketones and aldehydes can be synthesized directly from readily available allyic alcohols and boronic acids via palladium-catalyzedoxidativecross-coupling reactions. The dual roles of copper, including electron-carrier and Lewis acid functions, are supposed to be critical for the high reactivity and selectivity of this aerobic oxidative coupling transformation.
Photoexcited Ni<sup>II</sup>–Aryl Complex-Mediated Giese Reaction of Aryl Bromides
作者:Xian-Chen He、Ke-Rong Li、Jie Gao、Jian-Ping Guan、Hong-Bin Chen、Hao-Yue Xiang、Kai Chen、Hua Yang
DOI:10.1021/acs.orglett.3c01219
日期:2023.6.9
Giese reaction of aryl bromides with electron-deficient alkenes was developed, enabled by a dual catalyst system containing NiII complex and IrIII photocatalyst. This protocol could accommodate a variety of aryl bromides and electron-deficient alkenes, delivering the conjugate adducts in up to 97% yield. The utilization of photoexcited (dtbbpy)NiII(aryl)Br intermediate as an aryl radical source allows
开发了芳基溴化物与缺电子烯烃的 Giese 反应,该反应由包含 Ni II络合物和 Ir III光催化剂的双催化剂体系实现。该协议可以容纳各种芳基溴化物和缺电子烯烃,以高达 97% 的产率提供共轭加合物。利用光激发的 (dtbbpy)Ni II (芳基)Br 中间体作为芳基自由基源,可以实现芳基卤化物的这种新型转化,从而扩大激发镍催化的化学空间。
Double Arylation of Allyl Alcohol via a One-Pot Heck Arylation–Isomerization–Acylation Cascade
A one-pot, two-step catalytic protocol has been developed. A regloselective Heck coupling between aryl bromides and allyl alcohol leads to the generation of arylated allyl alcohols that in situ isomerize to give aldehydes, which then undergo an acylation reaction with a second aryl bromide. A variety of aryl bromides can be employed in both the initial Heck reaction and the acylation, providing easy access to a wide variety of substituted dihydrochalcones.
SYNTHESIS OF XANTHENES, INDANES, AND TETRAHYDRONAPHTHALENES VIA INTRAMOLECULAR PHENYL–CARBONYL COUPLING REACTIONS
作者:Chih-Wei Kuo、Jim-Min Fang
DOI:10.1081/scc-100103323
日期:2001.1
Benzaldehydes and acetophenones bearing tethered carbonyl chains underwent the intramolecular phenyl–carbonyl coupling reactions, by mediation of samarium diiodide and hexamethylphosphoramide, to afford the xanthenes and fused benzocarbocyclic compounds containing carbonyl and hydroxyl substituents.