highly functionalized chiral P-ylides can be easily synthesized through a copper-catalyzed asymmetric propargylic alkylation reaction from phosphonium salts and racemic propargylic esters. The subsequent Wittig reactions enable the synthesis of versatile alkene building blocks, chiral α-propargylic acrylates, and α-propargylic allenoates, with a wide substrate scope and satisfactory functional group
and limitations of the copper-catalyzedpropargylicamination of various propargylic esters with amines are presented, where optically active diphosphines such as Cl-MeO-BIPHEP and BINAP work as good chiral ligands. A variety of secondary amines are available as nucleophiles for this catalytic reaction to give the corresponding propargylic amines with a high enantioselectivity. The results of some stoichiometric
Difluorocarbene generated from FSO2CF2CO2SiMe3 (TFDA) at 120 °C could reacted with terminalalkynes having an ester group at the αposition to the triplebond. Difluorocyclopropenes were further converted to difluorocyclopropyl ketones under alkaline condition. Mechanism for the conversion was studied.
由FSO 2 CF 2 CO 2 SiMe 3(TFDA)在120°C下生成的二氟卡宾可以与在三键的α位具有酯基的末端炔烃反应。在碱性条件下,将二氟环丙烯进一步转化为二氟环丙基酮。研究了转化机理。
Copper-Catalyzed Intermolecular Asymmetric Propargylic Dearomatization of Indoles
作者:Wen Shao、He Li、Chuan Liu、Chen-Jiang Liu、Shu-Li You
DOI:10.1002/anie.201503042
日期:2015.6.22
The first copper‐catalyzed intermolecular dearomatization of indoles by an asymmetric propargylic substitution reaction was developed. This method provides a highly efficient synthesis of versatile furoindoline and pyrroloindoline derivatives containing a quaternary carbon stereogenic center and a terminal alkyne moiety with up to 86 % yield and 98 % ee.
Efficient Synthesis of N-Alkylated 4-Pyridones by Copper-Catalyzed Intermolecular Asymmetric Propargylic Amination
作者:Wen Shao、Ye Wang、Ze-Peng Yang、Xiao Zhang、Shu-Li You
DOI:10.1002/asia.201800373
日期:2018.5.4
Copper‐catalyzed intermolecularasymmetricpropargylicamination with 4‐hydroxypyridines has been realized for the first time. In the presence of Cu complex derived from Pybox ligand, the N‐propargylated 4‐pyridones were obtained under mild reaction conditions with up to 99 % yield and 95 % ee. The Pybox ligand bearing a 4‐F‐phenyl substituent plays a key role for the high enantioselectivity. The products