16619-12-8Relevant academic research and scientific papers
Structures and reactivities of ethylene dication electrophiles
Ohwada, Tomohiko,Yamazaki, Takahisa,Suzuki, Takayoshi,Saito, Shinichi,Shudo, Koichi
, p. 6220 - 6224 (1996)
1,2-Dicarbonyl compounds such as 2,3-butanedione reacted with benzene in the presence of a strong acid, trifluoromethanesulfonic acid, to give gem-diphenylated ketones in high yield. The monoxime derivative of 1,2-diones also reacted with benzene in the a
Enantioselective Nickel-Catalyzed Reductive Aryl/Alkenyl-Cyano Cyclization Coupling to All-Carbon Quaternary Stereocenters
Chen, Zi-Hao,Sun, Rui-Ze,Yao, Fei,Hu, Xu-Dong,Xiang, Long-Xue,Cong, Hengjiang,Liu, Wen-Bo
supporting information, p. 4776 - 4782 (2022/03/27)
An enantioselective nickel-catalyzed intramolecular reductive cross-coupling of C(sp2) electrophiles and cyano groups is reported. Enantioenriched CN-containing all-carbon quaternary stereocenters are assembled by desymmetrizing cyclization of aryl/alkeny
Formal Enone α-Arylation via I(III)-Mediated Aryl Migration/Elimination
Martins, Bruna S.,Kaiser, Daniel,Bauer, Adriano,Tiefenbrunner, Irmgard,Maulide, Nuno
supporting information, p. 2094 - 2098 (2021/04/05)
A formal enone α-arylation is described. This metal-free transformation relies on the I(III)-mediated skeletal reorganization of silyl enol ethers and features mild conditions, good yields, and high stereoselectivities for β-substituted enones.
Rhodium-catalyzed intramolecular hydroacylation of 1,2-disubstituted alkenes for the synthesis of 2-substituted indanones
Yuan, Jing,Liu, Chong,Chen, Yan,Zhang, Zhenfeng,Yan, Deyue,Zhang, Wanbin
, p. 269 - 277 (2018/12/05)
The intramolecular hydroacylation of 1,2-disubstituted alkenes was considered to be a challenging task due to the side reactions resulted from the lack of additional substituent at 1-position and the low activity caused by the steric hindrance of substituent at 2-position, and an asymmetric version has not been considered possible due to problems associated with the racemization of the products. We have partially solved these problems. Catalyzed by an activated diphosphine-Rh complex and reacted in a selected dihalogenated solvent, the intramolecular hydroacylation of o-(2-arylvinyl)benzaldehydes provided the corresponding 2-aryl-1-indanones in high yields, and its asymmetric variant using o-(2-alkylvinyl)benzaldehydes afforded chiral 2-alkyl-1-indanones in high yields and with moderate enantioselectivities.
B(C6F5)3-Catalyzed Highly Stereoselective Hydrogenation of Unfunctionalized Tetrasubstituted Olefins
Dai, Yun,Feng, Xiangqing,Du, Haifeng
supporting information, p. 6884 - 6887 (2019/10/02)
A metal-free hydrogenation of unfunctionalized tetrasubstituted olefins were successfully realized using a combination of B(C6F5)3 and Ph2NMe catalyst. The corresponding products were afforded in 58-98% yields with up to >99:1 cis/trans selectivity.
Enantiodivergent Synthesis of Tertiary α-Aryl 1-Indanones: Evidence Toward Disparate Mechanisms in the Palladium-Catalyzed Decarboxylative Asymmetric Protonation
Kingston, Cian,Guiry, Patrick J.
, p. 3806 - 3819 (2017/04/13)
Herein, we describe a study into the scope and origin of an enantiodivergent effect in the palladium-catalyzed decarboxylative asymmetric protonation. By switching the achiral proton source, both enantiomers of a series of tertiary α-aryl-1-indanones are readily accessed from the corresponding α-aryl-β-keto allyl esters. In this example of dual stereocontrol, enantioselectivities up to 94% (S) and 92% (R) were achieved using Meldrum's acid and formic acid, respectively. In an attempt to rationalize this switch in absolute configuration an investigation of the ambiguous mechanism of the decarboxylative asymmetric protonation was conducted. A novel catalytic cycle for the reaction with formic acid is proposed and subjected to a variety of experimental studies.
Rh-catalyzed reagent-free ring expansion of cyclobutenones and benzocyclobutenones
Chen, Peng-Hao,Sieber, Joshua,Senanayake, Chris H.,Dong, Guangbin
, p. 5440 - 5445 (2015/09/28)
Here we report a reagent-free rhodium-catalyzed ring-expansion reaction via C-C cleavage of cyclobutenones. A variety of poly-substituted cyclopentenones and 1-indanones can be synthesized from simple cyclobutenones and benzocyclobutenones. The reaction condition is near pH neutral without additional oxidants or reductants. The potential for developing a dynamic kinetic asymmetric transformation of this reaction has also been demonstrated. Further study supports the proposed pathway involving Rh-insertion into the cyclobutenone C-C bond, followed by β-hydrogen elimination, olefin insertion and reductive elimination.
Catalyst-controlled highly selective coupling and oxygenation of olefins: A direct approach to alcohols, ketones, and diketones
Su, Yijin,Sun, Xiang,Wu, Guolin,Jiao, Ning
supporting information, p. 9808 - 9812 (2013/09/23)
Oxygen? That's radical! A method for the direct synthesis of substituted alcohols, ketones, and diketones through a catalyst-controlled highly chemoselective coupling and oxygenation of olefins has been developed. The method is simple and practical, can be switched by the selection of different catalysts, and employs molecular oxygen as both an oxidant and a reagent. Copyright
Solvent-dependent behavior of arylvinylketones in HUSY-zeolite: a green alternative to liquid superacid medium
Sani Souna Sido, Abdelkarim,Chassaing, Stefan,Kumarraja, Mayilvasagam,Pale, Patrick,Sommer, Jean
, p. 5911 - 5914 (2008/02/10)
Depending on the reaction conditions, arylvinylketones can be directly and efficiently converted using zeolites to indanones by cyclization or to dihydrochalcones through regioselective aryl addition or chemoselective hydride transfer.
Cyclization of 1-phenyl-2-propen-1-ones into 1-indanones using H-zeolite and other solid acids. The role of mono- and dicationic intermediates
Koltunov, Konstantin Yu.,Walspurger, Stéphane,Sommer, Jean
, p. 8391 - 9394 (2007/10/03)
Cyclization of aryl vinyl ketones into 1-indanones was previously known to proceed only in drastic acidic or superacidic conditions due to the necessity of dicationic, superelectrophilic activation of starting compounds. In this paper, we disclose that available solid acids such as HUSY-zeolite, sulfated zirconia or heteropolyacid, H3PW12O40 can be successfully applied instead of superacids to perform these and related reactions. The cases, when the effective excess of acidic sites of the solid is required to carry out the reaction, are interpreted in terms of key dicationic (superelectrophilic) intermediates on the solid.
