Formation of<i>meta</i>-Substituted Phenols by Transition Metal-Free Aromatization: Use of 2-Bromocyclohex-2-en-1-ones
作者:Guojun Yu、Derrick L. J. Clive
DOI:10.1021/acs.joc.6b01653
日期:2016.9.16
or other organometallic reagents to 2-halocyclohex-2-en-1-ones bearing an alkyl or aryl group at C-5, followed by mild acid treatment and exposure to 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) at room temperature, generates meta-substituted phenols in which the newly introduced meta substituent originates from the Grignard reagent. The range of effective organometallic reagents includes alkyl, allyl,
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。
One-Pot Synthesis of 3,5-Disubstituted and Polysubstituted Phenols from Acyclic Precursors
A new strategy for the synthesis of 3,5-disubstituted phenols is established through one-pot Robinson annulation of α,β-unsaturated ketones with α-fluoro-β-ketoesters followed by in situ dehydrofluorination and tautomerization. This method has been extended to the synthesis of polysubstituted phenols and applied in the preparation of biologically active compounds.
A simple synthetic approach to aromatic compounds using combinations of RCM, dehydration, oxidation, and tautomerization is described.
描述了一种通过组合环加成反应(RCM)、脱水、氧化和互变异构化的简单合成方法来制备芳香化合物。
Polymer-supported preparation of substituted phenols: A new example of simultaneous cyclization-cleavage reaction on solid phase
作者:Alan R Katritzky、Sergei A Belyakov、Yunfeng Fang、John S Kiely
DOI:10.1016/s0040-4039(98)01771-7
日期:1998.10
A series of variously substituted phenols was synthesized in high yields using the “cyclization-cleavage” approach. Base-catalyzed reactions between α,β-unsaturated ketones and polymer-bound acetonyl groups result in a tandem Michael addition/annulation reaction followed by elimination and rearrangement into phenols. Since all intermediates are on the resin until the last stage, the final reaction