Switching reaction pathways of trifluoromethylated thiobenzanilides by choice of different oxidative systems
摘要:
Trifluoromethylated thiobenzanilides are efficiently converted to 2-trifluoromethylbenzothiazoles via intramolecular oxidative cyclization under CAN/NaHCO(3) oxidation, while the dimerized products with "-S-S-" bond linkage are obtained when PIDA is used as an oxidant. (C) 2011 Elsevier B.V. All rights reserved.
A lithium-bromide-promoted nucleophilicsubstitution/annulation cascade reaction between CF3-imidoyl sulfoxonium ylides and 1,3-dicarbonyl compounds has been established, and the corresponding 1,2,3-trisubstituted 5-trifluoromethylpyrroles have been obtained in 27–78% yield. This reaction features a broad substrate scope and generates dimethylsulfoxide and H2O as byproducts.
已经建立了溴化锂促进的 CF 3 -亚氨酰基锍叶立德与 1,3-二羰基化合物之间的亲核取代/环化级联反应,并在 27-78 年获得了相应的 1,2,3-三取代 5-三氟甲基吡咯% 屈服。该反应具有广泛的底物范围,并生成二甲基亚砜和 H 2 O 作为副产物。
Visible-Light-Induced Radical Cyclization of Trifluoroacetimidoyl Chlorides with Alkynes: Catalytic Synthesis of 2-Trifluoromethyl Quinolines
A simple and efficient method for the synthesis of 2‐trifluoromethyl quinolines by means of visible‐light‐induced radicalcyclization of trifluoroacetimidoylchlorides with alkynes has been developed. This protocol allows the generation of imidoyl radicals by activation of C(sp2)Cl bonds using a photoredox catalyst under mild and environmentally friendly conditions (see scheme).
Telescoped, Divergent, Chemoselective C1 and C1‐C1 Homologation of Imine Surrogates: Access to Quaternary Chloro‐ and Halomethyl‐Trifluoromethyl Aziridines
作者:Laura Ielo、Saad Touqeer、Alexander Roller、Thierry Langer、Wolfgang Holzer、Vittorio Pace
DOI:10.1002/anie.201812525
日期:2019.2.18
A conceptually novel, high‐yielding, mono‐ or bis‐homologation was realized with lithium halocarbenoids and enables the one‐step, fully chemocontrolled assembly of a new class of quaternary trifluoromethyl aziridines. Trifluoroacetimidoyl chlorides (TFAICs) act as convenient electrophilic platforms, enabling the addition of either one or two homologating elements by simply controlling the stoichiometry
A Stereoselective Glycosylation Approach to the Construction of 1,2‐
<i>trans</i>
‐β‐
<scp>d</scp>
‐Glycosidic Linkages and Convergent Synthesis of Saponins
作者:Fuzhu Yang、Wu Hou、Dapeng Zhu、Yu Tang、Biao Yu
DOI:10.1002/chem.202104002
日期:2022.2
Direct action: A highlystereoselective glycosylation protocol for the synthesis of 1,2-trans-β-d- or α-l-glycosidic linkages is disclosed, which employs a combination of glycosyl N-phenyltrifluroacetimidates as donors, FeCl3 as promoter, and CH2Cl2/nitrile as solvent and exploits glycosidation viaglycosyl α-nitrilium intermediates. A variety of natural saponins containing (1→2)-linked glycan motifs
A one-pot two-step fashion for the synthesis of 3-trifluoromethyl-1,4-benzoxazines from CF3-imidoyl sulfoxonium ylides and 2-bromophenols via lithium-bromide-promoted O–H insertion of sulfoxonium ylides and annulation has been demonstrated.