Highly diastereoselective synthesis of imidazolidine-dispirooxindoles via three-component [3 + 2] cycloadditions of isatins, 2-(aminomethyl)pyridine and isatin-based imines
作者:Hong-Wu Zhao、Xiao-Qin Chen、Zhao Yang、Ting Tian、Bo Li、Wei Meng、Xiu-Qing Song、Hai-Liang Pang
DOI:10.1039/c5ra21995g
日期:——
isatins, 2-(aminomethyl)pyridine and isatin-based imines proceeded readily, and furnished novel imidazolidine-dispirooxindoles in up to 84% yield with up to >99 : 1 diastereoselectivity. The relative configuration of the imidazolidine-dispirooxindoles was firmly confirmed on the basis of X-ray single crystalstructure analysis. The reaction mechanism was assumed to account for the diastereoselective formation
In pole position: A simple and efficient approach to spirocyclic γ‐lactam oxindoles by the N‐heterocyclic carbene catalyzed addition of homoenloate equivalents to N‐aryl isatinimines has been developed (see scheme). The use of N‐aryl isatinimines as electrophiles in the NHC‐catalyzed umpolung reaction of α,β‐unsaturated aldehydes is demonstrated for the first time.