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Communication | Regular issue | Vol 27, No. 9, 1988, pp.2103-2106
Published online, 1st January, 1970
DOI: 10.3987/COM-88-4655
Reinvestigation of the Diels-Alder Reaction of (E)-(R)-4,5-Di-O-isopropylidepent-2-enoates and Cyclopentadiene

Seiichi Takano,* Takumichi Sugihara, Kiyohiro Samizu, and Kunio Ogasawara

*Pharmaceutical Institute, Tohoku University, Aobayama, Sendai 980-8578, Japan

Abstract

Diels-Alder reaction between (E)-(R)-4,5-di-O-isopropylidenepent-2-enoates and cyclopentadiene under both uncatalyzed and catalyzed conditions has been reinvestigated. Contrary to the preceding reports, no high diastereofacial selection has been observed under both conditions.