Lanthanide induced intramolecular coupling of aldehydes and ketones with electron-deficient olefins
作者:Eric J. Enholm、Antigone Trivellas
DOI:10.1016/s0040-4039(01)80359-2
日期:1989.1
Aldehydes or ketones with a δ,ε-olefin bearing a conjugating electron-withdrawing group undergo reductive cyclization with samarium iodide to afford five-membered rings. Diastereoselectivities of > 250:1 have been obtained.