Complete Reversal in Regioselectivity in the Baeyer−Villiger Reaction of an α-CF3-Ketone and Theoretical Rationale for Axial Orientation of Sterically Demanding CF3 Group at the Transition State
摘要:
[GRAPHICS]The regioselectivity of the Baeyer-Villiger reaction of alpha-CF3-ketone is completely reversed from that in alpha-F-eq-ketone. Theoretical study rationalized that the reaction proceeds with the sterically demanding CF3 group in an axial orientation by strong dipole interaction. The guiding principle that strong dipole interaction can overcome steric repulsion as a determining factor not only in regio- but also in stereocontrol is proposed.
Direct C(sp
<sup>3</sup>
)−H Trifluoromethylation of Unactivated Alkanes Enabled by Multifunctional Trifluoromethyl Copper Complexes
作者:Geunho Choi、Geun Seok Lee、Beomsoon Park、Dongwook Kim、Soon Hyeok Hong
DOI:10.1002/anie.202012263
日期:2021.3
photoinduced reaction, the source of a trifluoromethyl radical as a hydrogen atom transfer reagent, and the source of a trifluoromethyl anion for functionalization. The reaction was initiated by the generation of reactive electrophilic carbon‐centered CF3 radical through photoinduced homolytic cleavage of bpyCu(CF3)3, followed by hydrogenabstraction from an unactivated C(sp3)−H bond. Comprehensive mechanistic
Electrochemical Synthesis of Fluorinated Ketones from Enol Acetates and Sodium Perfluoroalkyl Sulfinates
作者:Vera A. Vil’、Valentina M. Merkulova、Alexey I. Ilovaisky、Stanislav A. Paveliev、Gennady I. Nikishin、Alexander O. Terent’ev
DOI:10.1021/acs.orglett.1c01643
日期:2021.7.2
fluorinated ketones fromenolacetates and RfSO2Na in an undivided cell under constant current conditions was developed. The electrosynthesis proceeded via perfluoroalkyl radical generation from sodium perfluoroalkyl sulfinate followed by addition to the enolacetate and transformation of the resulting C radical to a fluorinated ketone. The method is applicable to a wide range of enolacetates and results
开发了在恒流条件下在未分隔的电池中由烯醇乙酸酯和 R f SO 2 Na电化学合成氟化酮。电合成通过从全氟烷基亚磺酸钠产生全氟烷基自由基,然后加入烯醇乙酸酯并将所得 C 自由基转化为氟化酮来进行。该方法适用于范围广泛的烯醇乙酸酯,并以 20% 至 85% 的产率获得所需的产品。
Bi(CF3)3/Cu(OCOCH3)2 — a new system for the synthesis of 2-trifluoromethylcycloalkan-1-ones, trifluoromethylanilines and phenyl(trifluoromethyl)sulfane
Bi(CF3)3 reacts in the presence of equimolar amounts of Cu(OCOCH3)2 and 1-morpholinocyclopentene to give 1-morpholino-2-trifluoromethylcyclopentene in 83% yield. This compound as well as intermediately formed 1-morpholino-2-trifluoromethylcyclohexene can easily be converted into the corresponding cycloketones (78 and 41% yield) using the Swarts procedure. In absence of a copper(II) source, no reactions
Photochemistry of 2-(Perfluoroalkyl)cycloalkanones
作者:Christoph Semisch、Paul Margaretha
DOI:10.1016/s0022-1139(00)85102-7
日期:1986.1
parent ketone 2-methylcyclohexanone. Substitution of the methyl group on C(2) by a CF3-group strongly enhances bimolecular reactions such as reduction product formation in 2-propanol or oxetane formation in the presence of alkenes. We now report preliminary results on monomolecular photochemical reactions of several 2-(perfluoroalkyl)cycloalkanones.
[reaction: see text] The radical trifluoromethylation of ketonesilylenolethers gave alpha-CF(3) ketones in good yields with wide scope of the ketonic substrates including acyclic ketones and cyclopentanone. The use of dialkylzinc to activate the silylenolethers is the key to the efficient radical trifluoromethylation.