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Catalytic asymmetric Povarov reaction of isatin-derived 2-azadienes with 3-vinylindoles†
Hong-Hao Zhang,Xiao-Xue Sun,Jing Liang,Yue-Ming Wang,Chang-Chun Zhao,Feng Shi
Organic & Biomolecular Chemistry Pub Date : 10/02/2014 00:00:00 , DOI:10.1039/C4OB01741B
Abstract

The first catalytic asymmetric Povarov reaction of isatin-derived 2-azadienes with 3-vinylindoles was established in the presence of chiral phosphoric acid, which tolerates a wide range of substrates with generally excellent diastereoselectivity and good enantioselectivity (up to >95 : 5 dr, 89 : 11 er). This approach will greatly enrich the chemistry of the catalytic asymmetric Povarov reaction, in particular ketone-involved transformations. Furthermore, this protocol represents the first diastereo- and enantio-selective construction of a spiro[indolin-3,2′-quinoline] framework bearing an indole moiety. This novel type of spiro-compound not only contains two chiral centers, including one quaternary stereogenic center, but also integrates two biologically important structures of spiro[indolin-3,2′-quinoline] and indole, which may find medicinal applications after bioassay.

Graphical abstract: Catalytic asymmetric Povarov reaction of isatin-derived 2-azadienes with 3-vinylindoles
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