Two-step conversion of carboxylic esters into distally fluorinated ketones via ring cleavage of cyclopropanol intermediates: application of sulfinate salts as fluoroalkylating reagents
作者:Yulia A. Konik、Marina Kudrjashova、Nele Konrad、Sandra Kaabel、Ivar Järving、Margus Lopp、Dzmitry G. Kananovich
DOI:10.1039/c7ob00680b
日期:——
used in the synthesis of distally fluorinated ketones. Cyclopropane ring cleavage reactions in methanol with aqueous tert-butyl hydroperoxide in the presence of a copper(II) acetate catalyst and sodium triflinate (Langlois reagent) afford β-trifluoromethyl ketones in 16–74% isolated yields. Sodium triflinate serves as a precursor of reactive trifluoromethyl copper species, enabling ring-opening trifluoromethylation
Cobalt-Catalyzed Regio- and Diastereoselective Formal [3 + 2] Cycloaddition between Cyclopropanols and Allenes
作者:Junfeng Yang、Qiao Sun、Naohiko Yoshikai
DOI:10.1021/acscatal.8b05114
日期:2019.3.1
reaction between a cyclopropanol and an allene viacyclopropanol ring opening, which affords a 3-alkylidenecyclopentanol derivative with high regio- and diastereoselectivities. The reaction tolerates monosubstituted, 1,1-disubstituted, and 1,3-disubstituted allenes and various functional groups. The reaction is proposed to proceed through carbometalation of the allene with a cobalt homoenolate followed by
A copper catalyzed ring-opening trifluoromethylation of cyclopropanols under mild reaction conditions was developed. A wide variety of synthetically useful β-trifluoromethyl ketones were obtained.
We report herein a nickel-catalyzed ring-opening allylation of cyclopropanols with allylic carbonates that occurs under mild and neutral conditions. The reaction displays linear selectivity for both linear and branched acyclic allylic carbonates and is also applicable to cyclic allylic carbonates, affording a variety of δ,ε-unsaturated ketones in moderate to good yields. Mechanistic experiments are
General Synthesis of Cyclopropanols via Organometallic Addition to 1-Sulfonylcyclopropanols as Cyclopropanone Precursors
作者:Roger Machín Rivera、Yujin Jang、Christopher M. Poteat、Vincent N. G. Lindsay
DOI:10.1021/acs.orglett.0c02303
日期:2020.8.21
surrogates accessible in enantioenriched form, such a trivial synthetic disconnection has received very little attention in the literature for the formation of tertiary cyclopropanols. In this work, we report a simple and high-yielding synthesis of 1-substituted cyclopropanols via the addition of diverse organometallic reagents to 1-phenylsulfonylcyclopropanols, acting here as in situ precursors of the