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N‐Heterocyclic Carbene Catalyzed Asymmetric Synthesis of Pentacyclic Spirooxindoles via [3+3] Annulations of Isatin‐Derived Enals and Cyclic N‐Sulfonyl Ketimines
Author(s) -
Liu Qiang,
Chen XiangYu,
Li Sun,
Rissanen Kari,
Enders Dieter
Publication year - 2019
Publication title -
advanced synthesis and catalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.541
H-Index - 155
eISSN - 1615-4169
pISSN - 1615-4150
DOI - 10.1002/adsc.201900065
Subject(s) - isatin , chemistry , stereocenter , enantioselective synthesis , annulation , catalysis , carbene , sulfonyl , enantiomer , organocatalysis , organic chemistry , stereochemistry , combinatorial chemistry , alkyl
A convenient enantioselective route to new types of pentacyclic spirooxindoles via [3+3] annulation reactions of isatin‐derived enals and cyclic N‐sulfonyl ketimines, using N‐heterocyclic carbene (NHC) catalysis has been developed. The new protocol leads to pentacyclic spirooxindoles bearing a quaternary spiro‐stereocenter in good yields and good to high enantiomeric ratios.