Intermolecular Coupling of Isomerizable Alkenes to Heterocycles via Rhodium-Catalyzed C−H Bond Activation
作者:Kian L. Tan、Robert G. Bergman、Jonathan A. Ellman
DOI:10.1021/ja0281129
日期:2002.11.1
intermolecular coupling of unactivated alkenes, including isomerizable alkenes, to a range of heterocycles using a Rh(I) catalyst. A variety of functional groups were incorporated, including esters, nitriles, and acetals. The intermolecular coupling became possible after it was discovered that weak acids dramatically increase the rate of both the inter- and intramolecularreactions.
Intermolecular Coupling of Alkenes to Heterocycles via C−H Bond Activation
作者:Kian L. Tan、Steve Park、Jonathan A. Ellman、Robert G. Bergman
DOI:10.1021/jo048666p
日期:2004.10.1
The intermolecular coupling of unactivated alkenes to a range of heterocycles using a Rh(I) catalyst was investigated. A variety of functional groups were incorporated into the alkene, including esters, nitriles, acetals, and phthalimide. Furthermore, the heterocycle tolerated substitution with both electron-rich and electron-deficient groups. The intermolecular coupling became possible after it was discovered that weak acids dramatically increase the rate of both the inter- and intramolecular reactions. An extensive optimization of additives was performed, and HCI.PCY3 (Cy = cyclohexyl) and HCI-P-t-Bu2Et were in general found to be the best additives for the reaction.