2007

Pyran derivativesR 0340 Asymmetric Diels—Alder Reactions of 2-Pyrones with a Bifunctional Organic

Catalyst. — The reaction in the presence of cinchona alkaloid catalysts affords bicyclic products with high yields and enantioselectivities and mostly exo-selectivity. Only in the case of the branched alkene (VI), the endo-product is obtained as the major one. — (WANG, Y.; LI, H.; WANG, Y.-Q.; LIU, Y.; FOXMAN, B. M.; DENG*, L.; J. Am. Chem. Soc. 129 (2007) 20, 6364-6365; Dep. Chem., Brandeis Univ., Waltham, MA 02454, USA; Eng.) — Y. Steudel

39- 114

2007