Abstract A decarboxylative hydroamination cascade reaction of 3-arylpropiolic acids with N-heterocycles under transition-metal-free conditions was developed. 3-Arylpropiolic acids were found to react smoothly with a range of N-heterocycles under the effect of t-BuOK to afford N-vinyl heterocycles in moderate to excellent yields. This reaction represents the first decarboxylative hydroamination of 3-arylpropiolic
CuI-Catalyzed Cross-Coupling
Reaction of (<i>E</i>)-Vinyl Bromides with
Nitrogen-Containing Heterocycles
作者:Jincheng Mao、Qiongqiong Hua、Jun Guo、Daqing Shi、Shunjun Ji
DOI:10.1055/s-2008-1077955
日期:——
An efficient and straightforward copper-catalyzed method allowing vinylation of N-nucleophiles with various substituted (E)-vinyl bromides under palladium-free and ligand-free conditions has taken a high yield (up to 95%). Noteworthy is that the double-bond geometry of these vinyl halides was retained with our protocol.
more hindered vinyl bromides, the use of the original bidentate chelator 8 was shown to be more efficient to promote the coupling reactions than our key tetradentate ligand 3. The corresponding N-(1-alkenyl)azoles and alkenyl aryl ethers are obtained in high yields and selectivities under very mild temperature conditions (35-110 degrees C for N-vinylation reactions and 50-80 degrees C for O-vinylation
Palladium-Catalyzed Stereocontrolled Vinylation of Azoles and Phenothiazine
作者:Artyom Y. Lebedev、Vyatcheslav V. Izmer、Denis N. Kazyul'kin、Irina P. Beletskaya、Alexander Z. Voskoboynikov
DOI:10.1021/ol0172370
日期:2002.2.1
with vinyl bromides catalyzed by palladium-phosphine complexes results in the respective N-vinylazoles in 30-99% yields. This reaction with cis- and trans-beta-bromostyrenes is stereospecific giving the respective products with full retention of configuration.
FREE CHOLESTEROL ANALOGS BEARING A BORON DIPYRROMETHENE DIFLUORO (BODIPY) FLUOROPHORE IN THE SIDE CHAIN AND METHOD OF PREPARATION AND USE THEREOF
申请人:Bittman Robert
公开号:US20080177059A1
公开(公告)日:2008-07-24
The present invention relates to free cholesterol analogs bearing a boron dipyrromethene difluoro (BODIPY) fluorophore in the side chain and methods of preparation. The compounds of the present invention can be used in fluorescence spectroscopy and fluorescence microscopy to visualize the exchange, distribution, and trafficking of free cholesterol between living cells and to monitor the movement of free cholesterol between ordered and disordered lipid domains in membranes.