PPh3-catalyzed ylide cyclization for the controllable synthesis of benzobicyclo[4.3.0] compounds: base effects and scope
作者:Long-Wu Ye、Xun Han、Xiu-Li Sun、Yong Tang
DOI:10.1016/j.tet.2007.11.052
日期:2008.2
A catalytic intramolecular ylide annulation for the controllable construction of benzobicyclo[4.3.0] ring systems with three continuous stereogenic centers is developed in a single manipulation. In the presence of 20 mol % of triphenylphosphine, the reactions of compounds 1a–1f afford benzobicyclo[4.3.0] compounds 3 and 4 as major products, respectively, with excellent diastereoselectivities in good