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Enantioselective hetero-Diels-Alder Reactions. -Some rare earth organophosphates are found to be efficient catalysts for asymmetric Diels-Alder reactions. The most potent ones are shown in the scheme. During the process, remarkably high asymmetric amplifications are observed as the first example in the metal ion-chiral ligand 1:3 catalytic system. -(FURUNO*, H.; HAYANO, T.; KAMBARA, T.; SUGIMOTO, Y.; HANAMOTO, T.; TANAKA, Y.; JIN, Y. Z.; KAGAWA, T.; INANAGA, J.; Tetrahedron 59 (2003) 52, 10509-10523; Inst. Mater. Chem. Eng., Kyushu Univ., Higashi, Fukuoka 812-81, Japan; Eng.) -Jannicke 15-119

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Pyran derivativesPyran derivatives R 0340 Highly Enantioselective Homogeneous Catalysis of Chiral Rare Earth Phosphates in the hetero-Diels-Alder Reaction. -Novel chiral rare earth metal complexes, preformed or generated in situ, are reported as homogeneous Lewis acid catalyst for the asymmetric hetero-Diels-Alder reaction of Danishefsky's diene (III) with carbonyl compounds. -(FURUNO, H.; KAMBARA, T.; TANAKA, Y.; HANAMOTO, T.; KAGAWA, T.; INANAGA*, J.; Tetrahedron Lett. 44 (2003) 32, 6129-6132; Inst. Mater. Chem. Eng., Kyushu Univ., Higashi, Fukuoka 812-81, Japan; Eng.) -Mais 47-123