Asymmetric Annulation of 3-Alkynylacrylaldehydes with Styrene-Type Olefins by Synergetic Relay Catalysis from AgOAc and Chiral Phosphoric Acid
作者:Hao Zhang、Le Zhu、Shaozhong Wang、Zhu-Jun Yao
DOI:10.1021/jo501196n
日期:2014.8.1
Asymmetric annulation of 3-alkynylacrylaldehydes with 2-hydroxystyrenes has been studied and achieved by synergetic catalysis from AgOAc and chiral phosphoric acid, providing the corresponding multiring products with decent total yields and moderate to excellent enantioselectivities (up to 95% ee). The developed mild multibond-formation cascade reaction involves in situ generation of pyrylium intermediate
Vinylogous Nicholas Reactions in the Synthesis of Icetexane, Faveline, and Related Ring Systems
作者:James Green、Izabela Kolodziej
DOI:10.1055/s-0030-1261221
日期:2011.10
The intramolecular vinylogous Nicholas reactions of aryl substituted acetoxy enyne-Co 2(CO) 6 complexes afford tri- cyclic 6,7,6- ring systems and relatedsystems in good yield.