JACS
Vol. 113, No. 5, 1991 1713-1729
Inverse electron-demand Diels-Alder reactions of N-sulfonyl .alpha.,.beta.-unsaturated imines: a general approach to implementation of the 4.pi. participation of 1-aza-1,3-butadienes in Diels-Alder reactions
Dale L. Boger, Wendy L. Corbett, Timothy T. Curran, and A. M. Kasper
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http://dx.doi.org/10.1021/ja00005a040JOC
Vol. 35, No. 11: 1970, 3691-3694
.alpha.-Methoxy-.alpha.-trifluoromethylphenylacetic acid. Configuration by asymmetric synthesis
Ladislav Hub and Harry S. Mosher
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http://dx.doi.org/10.1021/jo00836a023Спасибо