Ruthenium Hydride Catalyzed Silylvinylation of Internal Alkynes Using Ethylene as an Additive
作者:Robert J. Wilson、Lauren Kaminsky、Ijaz Ahmed、Daniel A. Clark
DOI:10.1021/acs.joc.5b01374
日期:2015.8.21
An efficient synthetic strategy for the regiospecific silylvinylation of internal alkynes is described. This transformation is catalyzed by RuHCl(CO)(SIMes)PPh3 and provides a net 5-exo-dig trans-silylvinylation of internal alkynes. Ethylene was used to decrease reaction times and displayed altered selectivity at increased pressure. Furthermore, alkyl-substituted alkynes were acceptable substrates at 80 psi of ethylene.
Ruthenium Catalyzed Cycloisomerization of Silicon-Tethered 1,7-Enynes To Give Exocyclic 1,3-Dienes
作者:Lauren Kaminsky、Daniel A. Clark
DOI:10.1021/ol5026926
日期:2014.10.17
The cycloisomerization of vinyl silicon-tethered 1,7-enynes has been accomplished using catalytic Cp*Ru(COD)Cl. The products possess a new silane moiety and trisubstituted alkenes as part of the diene system. The reaction scope includes aryl, alkyl, vinyl, and cyclopropyl alkyne functionalities. Silicon was found not to be a mandatory component of the tether. The utility of the products was demonstrated