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Synfacts 2008(11): 1227-1227  
DOI: 10.1055/s-0028-1083396
Polymer-Supported Synthesis
© Georg Thieme Verlag Stuttgart ˙ New York

Resin-Bound Pyrrolidine Catalysts for Enamine-Mediated Reactions

Contributor(s): Yasuhiro Uozumi, Yoichi M. A. Yamada, Hidetoshi Ohta
R. D. Carpenter, J. C. Fettinger, K. S. Lam, M. J. Kurth*
University of California - Davis and University of California - Davis Cancer Center, Sacramento, USA
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Publication History

Publication Date:
23 October 2008 (online)

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Significance

Tentagel-bound asymmetric pyrrolidine catalysts 1 and 2 are reported for the preparation of optically active chromanones 5. The catalysts mediated the asymmetric tandem aldol-Michael reactions with high enantioselectivity and complete diastereoselectivity. Thus, the reaction of 3 and cycloalkanones (4 and 6) was carried out with 1 in MeOH. The reaction mixture was then heated under microwave irradiation to give 5a-h in 71-90% yield with up to 97% ee (8 examples). The reaction with 2 under similar conditions afforded ent-5b-g and 5h in 77-94% yield with up to 99% ee (7 examples).