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| 概要 |
Methyl (E)-2-oxo-4-phenyl-, -4-methyl-, and -4-methoxy-3-butenoates as hetero 1,3-dienes undergo smooth hetero Diels-Alder reactions with vinyl ethers in the presence of a catalytic amount of lanthani...de catalysts. The reactions are highly endo-selective producing 2,4-cis-3,4-dihydro-2H-pyrans in moderate to high yields, the configuration at 3-position depending on the stereochemistry of the starting vinyl ethers. Catalytic asymmetric version of this reaction was also examined by using chiral lanthanide catalysts, but enantioselectivity was not satisfactory.続きを見る
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Mendeley出力
KJ00004507852