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In the presence of a cinchona alkaloid as a catalyst, the Diels-Alder
reaction of 3-hydroxy-2-pyrone with chiral N-acryloyl oxazolidinone af
forded a bicyclolactone adduct with high diastereoselectivities (up to
95%de) in almost quantitative yield. (C) 1998 Elsevier Science Ltd. A
ll rights reserved.