Sc(OTf)<sub>3</sub>-Catalyzed C2-Selective Cyanation/Defluorination Cascade of Perfluoroalkylated 3-Indolylmethanols and Application to the Synthesis of 3-Fluoro(perfluoroalkyl)-β-carbolines
perfluoroalkylated 3-indolylmethanols with TMSCN is described, which provides a novel and practical strategy for the synthesis of structurally diverse 3-(2-cyano)-indolyl substituted gem-difluoroalkenes and β-fluoro-β-perfluoroalkylalkenes. The reaction features excellent regio- and stereoselectivity and broad substrate scope. Notably, the obtained gem-difluoroalkenes and β-fluoro-β-perfluoroalkylalkenes
Reaction of fluorinated ketones with dialkyl phosphites: An efficient and selective transformation of aryl F-alkyl ketones into dialkyl aryl (F-alkyl)methyl phosphates
作者:Manabu Kuroboshi、Takashi Ishihara、Teiichi Ando
DOI:10.1016/s0022-1139(00)82785-2
日期:1988.5
with a variety of dialkyl phosphites in the presence (or absence) of a tertiary amine to give the corresponding dialkyl aryl(-alkyl)methyl phosphates in high yields. The reaction of methyl -phenyl ketone with the sodium salt of diethyl phosphite afforded a good yield of diethyl 1-(phenyl)ethyl phosphate. This reaction offers a new supplemental route to various polyfluorinated esters of phosphoric acid
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。
Asymmetric reduction of perfluoroalkyl ketones with chiral lithium alkoxides
Reduction of perfluoroalkyl ketones with chiral lithium alkoxides gave chiral α-perfluoroalkyl alcohols in high enantiomeric excesses. Interestingly, reaction of 2,2,2-trifluoroacetophenone (1) with lithium (S)-1-phenylethoxide (2) gave (S)-2,2,2-trifluoro-1-phenylethanol (3), while the same reaction of perfluorooctan-1-one (7) with 2 gave (R)-1H-1-phenylperfluorooctanol (8). Based on the speculation
用手性烷醇锂还原全氟烷基酮得到高对映体过量的手性α-全氟烷基醇。有趣的是,2,2,2-三氟苯乙酮(1)与(S)-1-苯基乙氧基锂(2)反应生成(S)-2,2,2,2-三氟-1-苯乙醇(3),而相同的反应将全氟辛烷-1-酮(7)与2进行反应,得到(R)-1 H -1-苯基全氟辛醇(8)。根据机理推测,该反应的空间效应顺序为C 7 F 15 >取代苯基> CF 3。
Novel reduction of perfluoroalkyl ketones with lithium alkoxides
作者:Yasser S. Sokeirik、Kazuyuki Sato、Masaaki Omote、Akira Ando、Itsumaro Kumadaki
DOI:10.1016/j.jfluchem.2005.09.020
日期:2006.1
1-hydroxy-1H-perfluorooctyl compound (4), which was supposed to be formed by the reduction of 3. A similar reaction of 2,2,2-trifluoroacetophenone with tert-butyllithium did not gave any reduction product. Detailed investigation showed that lithium ethoxide worked as the reducing agent of this abnormal reduction. By the reaction of lithium isopropoxide, an aldol product from 2,2,2-trifluoroacetophenone with acetone