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Corey's tamiflu intermediate was synthesized from a bicyclolactam adduct obtained by base-catalyzed Diels-Alder reaction of N-nosyl-3-hydroxy-2-pyridone with ethyl acrylate. A compound that has the same array of functional groups with the Corey's intermediate was obtained in four steps from the DA adduct in 47% overall yield. The intermediate itself was also prepared efficiently by simply changing the protective group.

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Terpenes U 0200Three Mexicanolides from the Root Bark of Entandrophragma angolense -[isolation, structure elucidation and antifeedant properties of the new mexicanolide-type limonoids angolensin A (I) -C (III)]. -(KIPASSA, N. T.; OKAMURA, H.; DOE, M.; MORIMOTO, Y.; IWAGAWA, T.; NAKATANI*, M.; Heterocycles 75 (2008) 1, 157-164; Dep. Chem. Biosci., Fac. Sci., Kagoshima Univ., Korimoto, Kagoshima 890, Japan; Eng.) -M. Bohle 22-183

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