21651-12-7Relevant articles and documents
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Noels,A.F. et al.
, p. 2527 - 2531 (1976)
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Chiral Pyridinium Phosphoramide as a Dual Br?nsted Acid Catalyst for Enantioselective Diels-Alder Reaction
Nishikawa, Yasuhiro,Nakano, Saki,Tahira, Yuu,Terazawa, Kanako,Yamazaki, Ken,Kitamura, Chitoshi,Hara, Osamu
supporting information, p. 2004 - 2007 (2016/06/01)
Chiral pyridinium phosphoramide 1·HX was designed to be a new class of chiral Br?nsted acid catalyst in which both the pyridinium proton and the adjacent imide-like proton activated by the electron-withdrawing pyridinium moiety could work cooperatively as strong dual proton donors. The potential of 1·HX was shown in the enantioselective Diels-Alder reactions of 1-amino dienes with various dienophiles including N-unsubstituted maleimide, which has yet to be successfully used in an asymmetric Diels-Alder reaction.
The enantioselective synthesis of tetracyclic methyllycaconitine analogues
Sparrow, Kevin,Barker, David,Brimble, Margaret A.
experimental part, p. 7989 - 7999 (2011/11/07)
A new enantioselective synthesis of ABEF ring analogues of methyllycaconitine has been developed using a chiral cobalt(III) salen-catalyzed Diels-Alder reaction to form the B ring. Subsequent elaboration to form the A, E and F rings was achieved by sequential Dieckmann, Mannich and Wacker-type cyclizations to afford tetracyclic analogues in 97.5% ee.
