An Alumino-Mannich Reaction of Organoaluminum Reagents, Silylated Amines, and Aldehydes
作者:Anika Tarasewicz、Deeba Ensan、Robert A. Batey
DOI:10.1002/chem.201801012
日期:2018.4.20
A multi‐component coupling using organoaluminum reagents, silylated amines, and aldehydes results in the formation of tertiary amines. Both alkenyl‐ and alkylaluminum reagents undergo reaction with iminium ion substrates for which the corresponding Petasis borono‐Mannichreactions are unsuccessful.
Activation of Pentafluorophenylsilanes by Weak Lewis Bases in Reaction with Iminium Cations
作者:Alexander D. Dilman、Vitalij V. Levin、Miriam Karni、Yitzhak Apeloig
DOI:10.1021/jo0606812
日期:2006.9.1
The Lewis base mediated carbon−carbon bond forming reactions between pentafluorophenylsilanes and iminium cations were studied theoretically and experimentally. The complexation of silanes with anionic Lewisbases was analyzed computationally using DFT methods at the B3LYP/6-31+G(d) level. The pentafluorophenyl group was found to exhibit a significant stabilizing effect on the formation of pentacoordinate
理论上和实验上研究了路易斯碱介导的五氟苯基硅烷与亚胺阳离子之间的碳-碳键形成反应。使用DFT方法在B3LYP / 6-31 + G(d)水平上对硅烷与阴离子路易斯碱的络合进行了计算分析。发现五氟苯基对五配位硅物质的形成表现出显着的稳定作用,其中(C 6 F 5)3 SiF和C 6 F 5 SiF 3是最强的路易斯酸。三角双锥硅醇R作为几何异构体的比较2(C 6 ˚F 5)SiXY -(R = Me,F,Cl; X,Y = F,Cl,ClO 4)表明,杂原子和C 6 F 5基团分别倾向于占据顶部和赤道位置。的C计算6 ˚F 5从硅烷到基转移过程Ñ,Ñ采用弱路易斯碱X时(1):-dimethyliminium阳离子导致以下结论- =氯-,CLO 4 -作为活化剂,R 2(C 6 ˚F 5)SiF比R 2(C 6 F 5)SiX(X = Cl,ClO 4); (2)C 6 F 5基团在顶端位置的
One-Pot Synthesis of 3-Fluoro-4-(trifluoromethyl)quinolines from Pentafluoropropen-2-ol and Their Molecular Modification
Pentafluoropropen-2-ol (PFP) was prepared by the reaction of hexafluoroacetone (HFA) with Mg/TMSCl. The one-pot tandem sequential reactions of PFP via Mannich addition with aldimines followed by Friedel-Crafts cyclization and aromatization afforded the title quinolines. A variety of corresponding 3-substituted quinolines were derived from the title quinoline by nucleophilic substitution of 3-fluorine with nucleophiles. A defluorinative transformation of the 4-trifluoromethyl group of the title quinoline with hydrazine afforded pyrazoloquinoline.
Nucleophilic trifluoromethylation with organoboron reagents
作者:Vitalij V. Levin、Alexander D. Dilman、Pavel A. Belyakov、Marina I. Struchkova、Vladimir A. Tartakovsky
DOI:10.1016/j.tetlet.2010.11.025
日期:2011.1
Potassium trialkoxy(trifluoromethyl)borates are shown to behave as convenient reagents for nucleophilic trifluoromethylation of non-enolizable aldehydes and N-tosylimines to give CF3-substituted alcohols and N-tosylamines in good yields. (C) 2010 Elsevier Ltd. All rights reserved.