An efficient regioselective synthesis of functionalized biphenyls via sequential reactions of aromatic aldehydes and β-keto esters or ketones
作者:Anindra Sharma、Jyoti Pandey、R.P. Tripathi
DOI:10.1016/j.tetlet.2009.02.001
日期:2009.4
Knoevenagel/Michael/Aldol reactions of aromatic aldehydes and β-keto esters/ketones in a sequential manner yielded intermediate cyclohexanones in good yields. The latter, on oxidative aromatization with iodine, afforded functionalized biphenyls with at least one phenolic hydroxyl in moderate to good yields.
芳族醛和β-酮酯/酮的Knoevenagel / Michael / Aldol反应以连续的方式以良好的收率得到中间体环己酮。后者在用碘进行氧化芳构化后,以中等至良好的产率获得了具有至少一个酚羟基的官能化联苯。
Indion 860 catalyzed cascade reaction: a greener approach to functionalized cyclohexanones and their novel analogues
作者:T. Bhaskar Kumar、G. Dhananjaya、Ch. Sumanth、S. Vaishaly、Gajanan Botre、M. Srinivasa Rao、K. B. Chandra Sekhar、K. Shiva Kumar、Manojit Pal
DOI:10.1039/c2ra23039a
日期:——
An Indion 860 mediated cascade reaction of β-ketoester or 1,3-diketone with alkyl/aryl/heteroaryl aldehydes afforded functionalized cyclohexanones in the open air. The catalyst can be recovered and recycled. Combining this methodology with other reactions in the same pot afforded diversity based novel molecules. Some of the synthesized compounds showed inhibition of PDE4 in vitro.
Syntheses and some features of five new cyclohexane-1,3-dicarboxylates with multiple stereogenic centers
作者:Arif M. Ismiyev、Abel M. Maharramov、Rafiga A. Aliyeva、Rizvan K. Askerov、Kamran T. Mahmudov、Maximilian N. Kopylovich、Houcine Naïli、Armando J.L. Pombeiro
DOI:10.1016/j.molstruc.2012.08.006
日期:2013.1
only cyclohexanone carbonyl moiety undergoes the transformation, leaving the β-keto ester carbonyls unreacted. Withing the compounds 1 – 5 , the increase in the Hammett’s σ p , related normal σ p n , inductive σ I , negative σ p - and positive σ p + polar conjugation and Taft’s σ p o substituent constants generally leads to the corresponding drift of δ O H and δ N H NMR chemical shifts to lower field
摘要 4-羟基-4-甲基-6-氧代-2-(4-取代苯基)-环己烷-1,3-二羧酸二乙酯与N'-(2-氯丙基)乙烷-1,2-二胺缩合得到1-(2-氯丙基)-9-羟基-9-甲基-7-苯基-1,4-二氮杂螺[4.5]癸烷-6,8-二羧酸二乙酯(2)及其对位取代甲基(1)、氯( 3 )、溴 ( 4 ) 和硝基 ( 5 ) 衍生物具有新的立体中心,通过元素分析、ESI-MS、IR、 1 H 和 13 C NMR 光谱和 X 射线单晶分析进行了充分表征(对于 2 )。缩合反应是区域选择性的,只有环己酮羰基部分发生转化,留下未反应的 β-酮酯羰基。对于化合物 1 – 5,哈米特的 σ p 增加,相关法向 σ pn ,归纳 σ I ,
Rabe; Elze, Justus Liebigs Annalen der Chemie, 1902, vol. 323, p. 94
作者:Rabe、Elze
DOI:——
日期:——
Catalysis by Amberlyst A-21: A Greener Approach to 4,5,6,7-Tetrahydro-1H-indazol-3(2<i>H</i>)-ones via Construction of Cyclohexanones
作者:Manam Sreenivasa Rao、Meda Haritha、Sunder Kumar Kolli、Mandava V. Basaveswara Rao、Manojit Pal
DOI:10.1080/00397911.2013.844260
日期:2014.4.18
The 4,5,6,7-tetrahydro-1H-indazol-3(2H)-one derivatives have been synthesized in good yields via a two-step method in a single pot. The initial step involved the construction of cyclohexanone ring from aromatic aldehydes and beta-ketoester in i-PrOH using an inexpensive and reusable catalyst (i.e., Amberlyst A-21) under mild reaction conditions. The utility of this catalyst has been demonstrated in synthesizing a range of cyclohexanone derivatives. The catalyst can be recovered and recycled, which makes this procedure simple, convenient, economically viable, and environmental friendly. [Supplementary materials are available for this article. Go to the publisher's online edition of Synthetic Communications (R) for the following free supplemental resource(s): Full experimental and spectral details.]