Journal of the American Chemical Society
Communication
551. (e) Smith, A. B., III; Dong, S.; Brenneman, J. B.; Fox, R. J. J. Am.
Chem. Soc. 2009, 131, 12109−12111. (f) (d) Smith, A. B., III; Fox, R.
J.; Vanecko, J. A. Org. Lett. 2005, 7, 3099−3102. (g) Nicolas, L.;
der Chemischen Industrie (Sachkostenzuschuss to N.M.) and
the Deutsche Forschungsgemeinschaft (Grant MA 4861/1-2).
Invaluable assistance from our HPLC (Ms. D. Klutt) and X-ray
̈
Anderl, T.; Steinmetz, H.; Jansen, F.; Hofle, G.; Laschat, S.; Taylor, R.
̈
(Dr. R. Goddard) departments is acknowledged.
E. Angew. Chem., Int. Ed. 2011, 50, 938−941. (h) Yuan, Y.; Men, H.;
Lee, C. J. Am. Chem. Soc. 2004, 126, 14720−14721.
(8) For the use of chiral amides in asymmetric keteniminium [2 + 2]
cycloadditions, see: (a) Houge, C.; Frisque-Hesbain, A. M.; Mockel,
A.; Ghosez, L. J. Am. Chem. Soc. 1982, 104, 2920−2921. (b) Ghosez,
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