MgCl 2 -catalyzed trifluoromethylation of carbonyl compounds using (trifluoromethyl)trimethylsilane as the trifluoromethylating agent
作者:Bin Cui、Hui Sun、Yibo Xu、Lili Duan、Yue-Ming Li
DOI:10.1016/j.tet.2017.10.021
日期:2017.11
Using (trifluoromethyl)trimethylsilane (TMSCF3) as the trifluoromethylating agent, MgCl2-catalyzed trifluoromethylation of carbonylcompounds proceeded readily at room temperature. In the presence of 10 mol% of MgCl2, a variety of carbonyl substrates such as aliphatic/aromatic aldehydes, acyclic/cyclic ketones and esters could be trifluoromethylated in DMF, giving the corresponding trimethylsilyl ethers
Lewis base-catalyzed perfluoroalkylation of carbonyl compounds and aldimines with (perfluoroalkyl)trimethylsilanes (TMSCF3, TMSC2F5, and TMSC3F7) is described. The nitrogen- or oxygen-containing an...
Acid-promoted cyclization of 2,4-diaryl-1,1,1-trifluorobut-3-en-2-oles and their TMS-ethers into CF<sub>3</sub>-indenes
作者:Matvei Yu. Martynov、Roman O. Iakovenko、Anna N. Kazakova、Irina A. Boyarskaya、Aleksander V. Vasilyev
DOI:10.1039/c7ob00406k
日期:——
2,4-Diaryl-1,1,1-trifluorobut-3-en-2-oles and their TMS-ethers in H2SO4 at room temperature in just 2 min are quantitatively cyclized into 1-aryl-3-trifluoromethyl-1H-indenes. The reaction proceeds through an intermediate formation of the corresponding CF3-allyl cations, which are cyclized regioselectively at the allyl carbon atom most remote from the CF3-group. The obtained CF3-indenes in solution
在室温下仅2分钟的时间内,将2,4-二芳基-1,1,1-三氟丁-3-烯-2-烯烃及其TMS-醚在H 2 SO 4中定量环化成1-芳基-3-三氟甲基- 1 H-茚。该反应通过中间形成相应的CF 3-烯丙基阳离子进行,该中间体在最远离CF 3-基团的烯丙基碳原子上区域选择性地环化。将得到的CF 3-茚在EtOAc溶液中,在硅胶存在下,在室温下于4小时内定量异构化成3-芳基-1-三氟甲基-1 H-茚。
Enantioselective Phosphine-Catalyzed Allylic Alkylations of <i>mix</i>-Indene with MBH Carbonates
作者:Junyou Zhang、Hai-Hong Wu、Junliang Zhang
DOI:10.1021/acs.orglett.7b02895
日期:2017.11.17
reported using a simple chiral sulfinamide phosphine-catalyzed asymmetric allylicalkylation of a mixture of indenes with Morita–Baylis–Hillman carbonates. The resulting derivatives can serve as a valuable synthetic building block for some drugs and natural products. Broad substrate scope and high regio- and enantioselectivity of this reaction were particularly remarkable.
New Stable Reagents for the Nucleophilic Trifluoromethylation. 1. Trifluoromethylation of Carbonyl Compounds with <i>N</i>-Formylmorpholine Derivatives
作者:T. Billard、S. Bruns、B. R. Langlois
DOI:10.1021/ol005987o
日期:2000.7.1
A new stable equivalent of the trifluoromethyl anion has been synthesized from fluoroform. It reacts with nonenolizable carbonyl compounds such as the Ruppert's reagent.