(<i>Z</i>)<i>-</i>Trifluoromethyl-Trisubstituted Alkenes or Isoxazolines: Divergent Pathways from the Same Allene
作者:Chaolun Liu、Glenn P. A. Yap、Casey A. Rowland、Marcus A. Tius
DOI:10.1021/acs.orglett.0c02546
日期:2020.9.18
protonation of trifluoromethyl allenes leads to tri- or tetrasubstituted alkenes with high (Z)-selectivity. Treatment of the same allenes with catalytic Au(I) initiates a reaction cascade that produces isoxazolines in high yield.
Biomimetic Reductive Amination of Fluoro Aldehydes and Ketones <i>via</i> [1,3]-Proton Shift Reaction.<sup>1</sup> Scope and Limitations
作者:Taizo Ono、Valery P. Kukhar、Vadim A. Soloshonok
DOI:10.1021/jo960503g
日期:1996.1.1
proceed essentially (>98%) intramolecularly with isotope exchange experiments. High chemical yields, the simplicity of the experimental procedure, and the low cost of all reagents employed make this biomimetic transamination of fluorocarbonyl compounds a practical method for preparing fluorine-containing amines of biological interest.
Preparation of 3-(Fluoroalkyl)-2-azadienes and Its Application in the Synthesis of (Fluoroalkyl)isoquinoline and -pyridine Derivatives
作者:Francisco Palacios、Concepción Alonso、Marta Rodríguez、Eduardo Martínez de Marigorta、Gloria Rubiales
DOI:10.1002/ejoc.200400770
日期:2005.5
A method for the preparation of 3-(fluoroalkyl)-substituted 2-azabutadienes 5 by aza-Wittig reaction of N-vinylic 3-(fluoroalkyl)phosphazenes 4 and aldehydes is reported. Thermal 6π-electrocyclization of these azadienes gives 3-(fluoroalkyl)-substituted isoquinolines 6. Also [4+2] cycloaddition of these heterodienes 5 with enamine 8 gives fluoroalkyl-substituted pyridine derivatives 10–16. However,
The treatment of F-alkyl ketones with sodium diethyl phosphite in tetrahydrofuran at −10 to 0 °C gave high yields of 1-substituted F-1-alkenyl phosphates, which readily reacted with amidine or hydrazine derivatives at room temperature to afford the corresponding fluorinated pyrimidines or pyrazoles, respectively, in good to excellent yields.
在四氢呋喃中在 -10 至 0 °C 下用二乙基亚磷酸钠处理 F-烷基酮,得到高产率的 1-取代 F-1-烯基磷酸酯,其在室温下容易与脒或肼衍生物反应,得到相应的氟化物。嘧啶类或吡唑类,分别具有良好到极好的产率。
A Convenient Synthetic Route to Tetrahydropyran-Based Liquid Crystals