Redox-Neutral Photocatalytic Cyclopropanation via Radical/Polar Crossover
作者:James P. Phelan、Simon B. Lang、Jordan S. Compton、Christopher B. Kelly、Ryan Dykstra、Osvaldo Gutierrez、Gary A. Molander
DOI:10.1021/jacs.8b05243
日期:2018.6.27
A benchtop stable, bifunctional reagent for the redox-neutral cyclopropanation of olefins has been developed. Triethylammonium bis(catecholato)iodomethylsilicate can be readily prepared on multigram scale. Using this reagent in combination with an organic photocatalyst and visible light, cyclopropanation of an array of olefins, including trifluoromethyl- and pinacolatoboryl-substituted alkenes, can
Ir-catalyzed enantioselective addition of an N-methyl C–H bond of 2-(methylamino)pyridine derivatives to α-trifluoromethylstyrenes proceeded via C–Hactivation to give chiral γ-branched amine derivatives having a trifluoromethyl-substituted stereocenter. It was found that a bulky and electron-withdrawing group at the 3-position of 2-(methylamino)pyridines was necessary for the present C–H addition reaction
Palladium-catalyzed cross-coupling of unactivated alkylzinc reagents with 2-bromo-3,3,3-trifluoropropene and its application in the synthesis of fluorinated amino acids
trifluoromethylated and difluoromethylated aminoacids that are of great interest in peptide/protein based chemical biology. The advantages of the synthesis of these fluorinated aminoacids are synthetic simplicity and diversity from a simple and readily available key intermediate α-trifluoromethylalkene-containing aminoacid, providing a facile route for applications in medicinal chemistry and life science
Ni-Catalyzed Radical-Promoted Defluoroalkylborylation of Trifluoromethyl Alkenes To Access <i>gem</i>-Difluorohomoallylic Boronates
作者:Jian Qiu、Cece Wang、Lu Zhou、Yixian Lou、Kai Yang、Qiuling Song
DOI:10.1021/acs.orglett.2c00800
日期:2022.4.1
gem-difluoroalkenes and organoboroncompounds. However, the strategies for the construction of gem-difluorohomoallyl boronates has scarcely been described. Herein, we develop an efficient protocol for the construction of gem-difluorohomoallylic boronates through a Ni-catalyzed radical-promoted defluoroalkylborylation of α-trifluoromethyl alkenes with α-haloboronates under mild conditions. This reaction features a
gem -Difluoroalkenyl boronates 是用于构建各种gem -difluoroalkenes和有机硼化合物的有吸引力的合成子。然而,几乎没有描述构建偕二氟高烯丙基硼酸酯的策略。在此,我们开发了一种有效的方案,用于在温和条件下通过 Ni 催化的自由基促进的 α-三氟甲基烯烃与 α-卤代硼酸酯的脱氟烷基硼酸化来构建偕二氟高烯丙基硼酸酯。该反应具有广泛的底物范围、良好的官能团耐受性和多种转化。