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David A. Evans Edward J. Olhava Jeffrey S. Johnson Jacob M. Janey 《Angewandte Chemie (International ed. in English)》1998,37(24):3372-3375
Air-stable and recyclable , the CuII–(bis)oxazoline complex 1 efficiently catalyzes diastereo- and enantioselective hetero-Diels–Alder reactions between β,γ-unsaturated α-keto acid derivatives 2 and vinyl ethers for the synthesis of substituted dihydropyrans 3 [Eq. (1)]. Results of the crystal structure analysis of 1 in combination with calculations on model compounds indicate the formation of a reactive intermediate through replacement of the two H2O ligands with a chelating substrate. X=OEt, N(OMe)Me; R=alkyl, aryl, alkoxy, thiobenzyl. 相似文献
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