Mizoroki–Heck reaction of 1,2-disubstituted aryl alkenes: Variables of synthesis, solvent and ligand modulation of reactivity
作者:Pronnoy G. Bangar、Priyanka R. Jawalkar、Swapnil R. Dumbre、Pallavi K. Raut、Dharmaraj J. Patil、Neethu Tv、Shana Sudhakaran、Suresh Iyer
DOI:10.1080/00397911.2020.1811986
日期:2020.12.16
Abstract Reaction of aryl iodides with 1,2-disubstituted aryl alkenes in the presence of TBABr/TBACl gave high yields of the Mizoroki–Heck product. Phosphine ligands were used for the modulation of reactivity and stereoselectivity, for the reaction of 4-iodoanisole with cinnamaldehyde. tert-Bu3P.HBF4 gave the highest E:Z ratio of 1:0.08. The use of PEG-200 and PEG-400 as solvent could activate the
Lewis Acid Catalyzed Ring‐Opening Reaction of Cyclobutanones towards Conjugated Enones
作者:Min Zhang、Jiqiang Gao、Jinbo Zhao、Tingtian Qiu、Zhongjuan Li、Ziteng Guo、Chunhui Liu、Yu Liu
DOI:10.1002/ejoc.202101335
日期:2021.12.7
An unprecedented Fe-catalyzed ring-opening reaction of simple cyclobutanones was disclosed. Such a novel approach givesaccess to substituted conjugate enones with good functional group tolerance in high yields under mild conditions.
Ligand‐free palladium‐catalyzed tandem pathways for the synthesis of 4,4‐diarylbutanones and 4,4‐diaryl‐3‐butenones under microwave conditions
作者:Anna Wirwis、Anna M. Trzeciak
DOI:10.1002/aoc.4870
日期:2019.5
Two efficient Pd‐catalyzed tandem pathways for the synthesis of 4,4‐diaryl‐2‐butanones and 4,4‐diaryl‐3‐buten‐2‐ones were elaborated. The first step in both procedures was the Heck coupling of methyl vinyl ketone (MVK) and various aryl iodides leading to 4‐aryl‐3‐buten‐2‐one with the yield of up to 92% in 1 hr. The second step performed with the same catalyst and a new portion of aryl iodide in the
阐述了两种有效的Pd催化串联途径,用于合成4,4-二芳基-2-丁酮和4,4-二芳基-3-丁二酮。两种方法的第一步都是甲基乙烯基酮(MVK)与各种芳基碘化物的Heck偶联反应,生成4-芳基-3-丁烯-2-酮,在1小时内产率高达92%。第二步是在K 2 CO 3为碱的情况下,使用相同的催化剂和新的一部分碘代芳基化物,以高收率生产4,4-二芳基-3-丁烯-2-酮。当使用叔胺代替K 2 CO 3时,反应选择性完全变为饱和的4,4-二芳基-2-丁酮,还原性的Heck产物。由于施加了微波辐射(MW),使用0.5 mol%的Pd(OAc)2催化剂而没有额外的配体,可以在短时间内(4小时)以高收率获得所需的产物。
Selective reactivity of electron-rich aryl iodides in the Heck arylation of disubstituted alkenes catalyzed by palladium–arylurea complexes
作者:Matthew R. Smith、Young Jin Jang、Jung Yun Kim、Marco A. Ciufolini
DOI:10.1016/j.tet.2013.09.019
日期:2013.11
A catalyst consisting of 1 mol % of the 1:2 complex of Pd(OAc)(2) with N-(4-carbethoxyphenyl)urea promotes the Heck arylation of 2- or 3-substituted, conjugated esters, nitriles, aldehydes, and ketones (an uncharacteristically broad range of substrates), but only with electron-rich aryl iodides (an uncharacteristically narrow range of halides). (C) 2013 Elsevier Ltd. All rights reserved.
Reactions of acetylene ketones in superacids
作者:S. A. Aristov、A. V. Vasil’ev、G. K. Fukin、A. P. Rudenko
DOI:10.1134/s1070428007050107
日期:2007.5
Vinyl type cations ArC+=CHCOR generated from acetylene ketones ArC CCOR in superacids HSO3F and CF3SO3H react with diverse benzene derivatives to form alkenylation products, E-/Z-isomers of diarylpropenone structures Ar(Ar')C=CHCOR. The alkenylation of aromatic compounds with acetylene ketones in superacids occurs with the primary syn-addition of a hydrogen and an aryl residue to the acetylene bond followed by transformation of the product into anti-isomer under the conditions of the reaction.