Access to 2′,3′-dihydro-1′H-spiro[indoline-3,4′-pyridin]-2-ones via amino acid derived phosphine-catalyzed asymmetric [4+2] annulation with easily available oxindole-derived α,β-unsaturated imines
作者:Xiao-Nan Zhang、Xiang Dong、Yin Wei、Min Shi
DOI:10.1016/j.tet.2014.02.052
日期:2014.4
The phosphine-catalyzed asymmetric [4+2] annulation of vinyl ketones with more easily available oxindole-derived α,β-unsaturated imines has been further developed in the presence of an easily available multifunctional thiourea-phosphine catalyst derived from natural aminoacid, providing the enantioselective synthesis of 2′,3′-dihydro-1′H-spiro[indoline-3,4′-pyridin]-2-ones in good yields and moderate