Arene Trifunctionalization with Highly Fused Ring Systems through a Domino Aryne Nucleophilic and Diels–Alder Cascade
作者:Jia He、Zizi Jia、Hongcheng Tan、Xiaohua Luo、Dachuan Qiu、Jiarong Shi、Hai Xu、Yang Li
DOI:10.1002/anie.201911730
日期:2019.12.16
A convenient and efficient domino aryne process was developed under transition-metal-free conditions to generate a range of tetra- and pentacyclic ring systems. This transformation was realized via a 1,2-benzdiyne through a nucleophilic and Diels-Alder reaction cascade using styrene as the diene moiety. Three new chemical bonds, namely one C-N and two C-C bonds, and two benzofused rings could be constructed
Palladium-Catalyzed Aerobic Dehydrogenation of Substituted Cyclohexanones to Phenols
作者:Yusuke Izawa、Doris Pun、Shannon S. Stahl
DOI:10.1126/science.1204183
日期:2011.7.8
ortho-dimethylaminopyridine ligand, for the conversion of substituted cyclohexanones to the corresponding phenols. The reaction proceeds via successive dehydrogenation of two saturated carbon-carbon bonds of the six-membered ring and uses molecular oxygen as the hydrogen acceptor. This reactivity demonstrates a versatile and efficient strategy for the synthesis of substituted aromatic molecules with fundamentally different
苯酚衍生物由可带有多种取代基的非芳香环化合物制备。芳香分子是许多药物、电子材料和日用塑料的关键成分。这些分子的效用直接反映了芳环上取代基的身份和模式。在这里,我们报告了一种钯 (II) 催化剂体系,结合了非常规的邻二甲氨基吡啶配体,用于将取代的环己酮转化为相应的酚类。该反应通过六元环的两个饱和碳-碳键的连续脱氢进行,并使用分子氧作为氢受体。
Dienediolates of unsaturated carboxylic acids in synthesis. Synthesis of cyclohexenones and polycyclic ketones by tandem Michael-Dieckmann decarboxylative annulation of unsaturated carboxylic acids.
作者:María J. Aurell、Pablo Gaviña、Ramon Mestres
DOI:10.1016/s0040-4020(01)86973-8
日期:1994.2
Substituted 2-cyclohexenones 4 to 7 and hexaxydronaphthalenones and hexahydroindenones 13 to 18 are prepared by tandem Michael-Dieckmann addition of lithium dienediolates of acyclic and alicyclic unsaturated carboxylic acids to the lithium salts of the same or other unsaturated carboxylic acids.
A New Annulation Reagent, 2-Oxo-3-alkenylphosphonates. Reactions with Carbonyl-Stabilized Carbanions or Silyl Enol Ethers Leading to Cyclohexenones
作者:Eiji Wada、Junji Funakoshi、Shuji Kanemasa
DOI:10.1246/bcsj.65.2456
日期:1992.9
The reactions of 2-oxo-3-alkenylphosphonates with carbonyl-stabilized carbanions directly lead to 2-cyclohexen-1-ones through a sequence of Michael reaction and intramolecular Horner–Emmons olefination. On the other hand, the Lewis acid-mediated reactions with silyl enol ethers produce 1,5-diketones as Michael adducts, which then undergo cyclization on treatment with sodium hydride or triethylamine/zinc
2-oxo-3-alkenylphosphonates 与羰基稳定的碳负离子的反应通过一系列 Michael 反应和分子内 Horner-Emmons 烯化直接导致 2-cyclohexen-1-ones。另一方面,路易斯酸介导的与甲硅烷基烯醇醚的反应产生 1,5-二酮作为迈克尔加合物,然后在用氢化钠或三乙胺/溴化锌 (II) 处理后进行环化,得到 2-环己烯-1-或 2-phosphinyl-2-cyclohexen-1-ones,分别。
Palladium mediated one-pot synthesis of 3-aryl-cyclohexenones and 1,5-diketones from allyl alcohols and aryl ketones
One-pot synthesis of Robinson annulated 3-aryl-cyclohexenones from allyl alcohols and ketones using palladium is reported. Long chain aliphatic or aryl substitutions at the C1 position of allyl alcohol result in the formation of 1,5-diketone products. This simple one-pot method avoids the use of highly electrophilic vinyl ketones.