Readily available from esters or ketones, cyclopropanols are inclined to undergo diverse ring-opening transformations. Their one-electron oxidation is a conventional way to β-carbonyl radicals. However, despite this fact, their application as a coupling partner in dual photoredox and nickel-catalyzed reactions with organic halides remains underdeveloped. Here, we report that the Ti(OiPr)4 additive
环丙醇很容易从酯或酮中获得,倾向于进行各种开环转化。它们的单电子氧化是β-羰基自由基的常规方式。然而,尽管如此,它们作为偶联伙伴在与有机卤化物的双重光氧化还原和镍催化反应中的应用仍然不成熟。在这里,我们报告了 Ti(O i Pr) 4添加剂使这种难以捉摸的与芳基溴和烯基溴的交叉偶联成为可能,从而产生 β 取代的酮。
Asymmetric Aminocatalytic Michael Addition of Cyclopropane-Containing Aldehydes to Nitroalkenes
Abstract An asymmetric aminocatalytic approach to alkylidenecyclopropane derivatives via Michaeladdition of aldehydes to nitroalkene derivatives was developed. An asymmetric aminocatalytic approach to alkylidenecyclopropane derivatives via Michaeladdition of aldehydes to nitroalkene derivatives was developed.
Simple access to β-trifluoromethyl-substituted ketones via copper-catalyzed ring-opening trifluoromethylation of substituted cyclopropanols
作者:Dzmitry G. Kananovich、Yulia A. Konik、Dzmitry M. Zubrytski、Ivar Järving、Margus Lopp
DOI:10.1039/c5cc02386f
日期:——
A variety of β-trifluoromethyl ketones have been easily prepared by CuCl-catalyzed ring-opening trifluoromethylation of cyclopropanols with Togni reagent.
一种多样的β-三氟甲基酮已经通过CuCl催化的环丙醇与Togni试剂的环开三氟甲基化反应轻松制备。
Rhodium(III)-Catalyzed Mild Alkylation of (Hetero)Arenes with Cyclopropanols via C–H Activation and Ring Opening
作者:Xukai Zhou、Songjie Yu、Zisong Qi、Lingheng Kong、Xingwei Li
DOI:10.1021/acs.joc.6b00650
日期:2016.6.3
alkylation of (hetero)arenes using cyclopropanols as a reactive and efficient coupling partner under oxidative conditions has been developed. This coupling occurred at room temperature via C–H activation of arenes and C–C cleavage of cyclopropanols. Various types of (hetero)arenes (indolines, carbazole, tetrahydrocarbazole, pyrrole, thiophene, etc.) were all successfully reacted under the present conditions
Visible‐Light‐Induced C4‐Selective Functionalization of Pyridinium Salts with Cyclopropanols
作者:Mari Vellakkaran、Taehwan Kim、Sungwoo Hong
DOI:10.1002/anie.202113658
日期:2022.1.3
Visible-light-induced β-carbonyl alkylation of pyridines was developed by employing various cyclopropanols and N-amidopyridinium salts under mild conditions. This method provides an effective tool for the synthesis of valuable β-pyridyl-functionalized carbonyl frameworks with excellent C4 selectivity and the late-stage functionalization of complex and medicinally relevant molecules.