A palladium‐catalyzed four‐component carbonylative coupling reaction involving aryl halides, internal alkynes, arylboronic acids, and CO has been developed for the first time. All‐carbon substituted α‐unsaturated ketones and benzofulvenes can be selectively obtained in a highly regio‐ and stereocontrolled manner. Using Cu(TFA)2 as the additive, a series of tetrasubstituted α‐unsaturated ketones were
Ni-Catalyzed Divergent Cyclization/Carboxylation of Unactivated Primary and Secondary Alkyl Halides with CO<sub>2</sub>
作者:Xueqiang Wang、Yu Liu、Ruben Martin
DOI:10.1021/jacs.5b03340
日期:2015.5.27
A user-friendly Ni-catalyzed reductive cyclization/carboxylation of unactivated alkyl halides with. CO2 is described: The protocol operates under mild conditions with, an excellent chemoselectivity profile and a divergent syn/anti selectivity pattern that can be easily modulated by the Substrate utilized.
US7642391B1
申请人:——
公开号:US7642391B1
公开(公告)日:2010-01-05
Rhodium-Catalyzed Intramolecular Hydroacylation of 5- and 6-Alkynals: Convenient Synthesis of ?-Alkylidenecycloalkanones and Cycloalkenones
novel intramolecularhydroacylation of 5- and 6-alkynals leading to alpha-alkylidenecycloalkanones was accomplished by using cationic a rhodium(I)/BINAP complex. For all cyclizations described, a single (E)-olefin isomer was obtained. At elevated temperature, hydroacylation and double bond migration of 5- and 6-alkynals proceeded in a one-pot reaction to give cycloalkenones. An intramolecular hydroacylation
Ligand-, Copper-, and Amine-Free Sonogashira Reaction of Aryl Iodides and Bromides with Terminal Alkynes
作者:Sameer Urgaonkar、John G. Verkade
DOI:10.1021/jo049325e
日期:2004.8.1
and amine-free palladium-catalyzed Sonogashirareaction of aryl iodides and bromides with terminal alkynes have been developed. Critical to the success of this new protocol is the use of tetrabutylammonium acetate as the base. Noteworthy features of this method are room-temperature conditions and the tolerance of a broad range of functional groups in both reaction partners.