Chiral squaramide-catalysed enantioselective Michael/cyclization cascade reaction of 3-hydroxyoxindoles with α,β-unsaturated N-acylated succinimides
作者:Sheng Ming、Bo-Liang Zhao、Da-Ming Du
DOI:10.1039/c7ob01307h
日期:——
Michael/cyclizationcascadereaction of 3-hydroxyoxindoles with α,β-unsaturated N-acylated succinimides is disclosed. With quinine-derived squaramide as the catalyst, a broad range of the desired spirooxindole lactone derivatives bearing two contiguous stereocenters were obtained in good yields (up to 89%) with high diastereoselectivities (up to >95:5 dr) and excellent enantioselectivities (up to 99%