Stereoselective 1,6-Conjugate Addition/Annulation of <i>para</i>-Quinone Methides with Vinyl Epoxides/Cyclopropanes
作者:Chao Ma、Yuan Huang、Yu Zhao
DOI:10.1021/acscatal.6b01845
日期:2016.10.7
Here, we present an unprecedented formal [3 + 2] cycloaddition of para-quinone methides with vinyl epoxides/cyclopropanes to deliver a wide range of spiro[4.5]decanes in high efficiency and stereoselectivity. The commercial availability of the catalysts and reagents, together with the convenient procedure, makes it an attractive method in asymmetric synthesis.
One-Pot Tandem Diastereoselective and Enantioselective Synthesis of Functionalized Oxindole-Fused Spiropyrazolidine Frameworks
作者:Liang-Yong Mei、Xiang-Ying Tang、Min Shi
DOI:10.1002/chem.201403990
日期:2014.10.6
A highly efficient palladium(0)‐catalyzed asymmetric [3+2] cycloaddition using 3‐diazooxindoles serving as dipolarophiles affords functionalized pyrazolidinederivatives in an atom‐economical way. In addition, by trapping the pyrazolidinederivatives with maleimides, the corresponding spiropyrazolidine oxindoles containing multiple stereogenic centers have been obtained in high yields along with moderate