Synthesis of Exclusively 4-Substituted β-Lactams through the Kinugasa Reaction Utilizing Calcium Carbide
作者:Abolfazl Hosseini、Peter R. Schreiner
DOI:10.1021/acs.orglett.9b01192
日期:2019.5.17
A new Kinugasa reaction protocol has been elaborated for the one-pot synthesis of 4-substituted β-lactams utilizing calcium carbide and nitrone derivatives. Calcium carbide is thereby activated by TBAF·3H2O in the presence of CuCl/NMI. The ease of synthesis and use of inexpensive chemicals provides rapid access of practical quantities of β-lactams exclusively substituted at position 4.
1,1-Diphosphines and divinylphosphines <i>via</i> base catalyzed hydrophosphination
作者:N. T. Coles、M. F. Mahon、R. L. Webster
DOI:10.1039/c8cc05890c
日期:——
be reported: these narrow bite angle pro-ligands have been used to great effect as ligands in homogeneouscatalysis. We herein demonstrate that terminal alkynes readily undergo double hydrophosphination with HPPh2 and catalytic potassium hexamethyldisilazane (KHMDS) to generate 1,1-diphosphines. A change to H2PPh leads to the formation of P,P-divinyl phosphines.
Access to C4-Functionalized Quinolines via Copper-Catalyzed Tandem Annulation of Alkynyl Imines with Diazo Compounds
作者:Ruifeng Zhu、Guolin Cheng、Chunqi Jia、Lulu Xue、Xiuling Cui
DOI:10.1021/acs.joc.6b01227
日期:2016.9.2
An efficient synthesis of C4-functionalized quinolines through copper-catalyzed tandem annulation of alkynyl imines with diazo compounds is described. This transformation involves an in situ formation of allene and intramolecular electrocyclization, which features high efficiency, mild reaction conditions, easy operation, and broad functional-group tolerance. A wide variety of C4-functionalized quinolines were provided in up to 92% yield for 33 examples.
[EN] UNSATURATED IMINE COMPOUND AND USE THEREOF FOR PEST CONTROL<br/>[FR] COMPOSÉ IMINE INSATURÉE ET SON UTILISATION POUR LA PROTECTION PHYTOSANITAIRE