Straightforward access to useful synthetic intermediates is provided by this new method. Simple, α,β-unsaturated aldehydes are excellent substrates in the hetero-Diels-Alder reaction with inverse electron demand, catalyzed by CrIII-Schiff base complexes (see scheme; R1, R2 = alkyl or aryl) in the presence of 4-Å molecular sieves and no solvent. The resulting dihydropyrans are obtained in high enantio- (89-98 % ee) and diastereoselectivity (> 95 % de) and yield (40-95 %).
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Univ Autonoma Madrid, Fac Ciencias, Dept Quim Organ Modulo 1, Madrid 28049, SpainUniv Autonoma Madrid, Fac Ciencias, Dept Quim Organ Modulo 1, Madrid 28049, Spain
Laina-Martin, Victor
Fernandez-Salas, Jose A.
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Univ Autonoma Madrid, Fac Ciencias, Dept Quim Organ Modulo 1, Madrid 28049, Spain
Univ Autonoma Madrid, Inst Adv Res Chem Sci IAdChem, Madrid 28049, SpainUniv Autonoma Madrid, Fac Ciencias, Dept Quim Organ Modulo 1, Madrid 28049, Spain
Fernandez-Salas, Jose A.
Aleman, Jose
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Univ Autonoma Madrid, Fac Ciencias, Dept Quim Organ Modulo 1, Madrid 28049, Spain
Univ Autonoma Madrid, Inst Adv Res Chem Sci IAdChem, Madrid 28049, SpainUniv Autonoma Madrid, Fac Ciencias, Dept Quim Organ Modulo 1, Madrid 28049, Spain
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Nagoya Univ, Grad Sch Engn, Chikusa Ku, Nagoya, Aichi 4648603, JapanNagoya Univ, Grad Sch Engn, Chikusa Ku, Nagoya, Aichi 4648603, Japan
Matsumura, Yuki
Suzuki, Takahiro
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Nagoya Univ, Grad Sch Engn, Chikusa Ku, Nagoya, Aichi 4648603, JapanNagoya Univ, Grad Sch Engn, Chikusa Ku, Nagoya, Aichi 4648603, Japan
Suzuki, Takahiro
Sakakura, Akira
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Okayama Univ, Grad Sch Nat Sci & Technol, Kita Ku, Okayama 7008530, JapanNagoya Univ, Grad Sch Engn, Chikusa Ku, Nagoya, Aichi 4648603, Japan
Sakakura, Akira
Ishihara, Kazuaki
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Nagoya Univ, Grad Sch Engn, Chikusa Ku, Nagoya, Aichi 4648603, Japan
Japan Sci & Technol Agcy JST, CREST, Nagoya, Aichi 4648603, JapanNagoya Univ, Grad Sch Engn, Chikusa Ku, Nagoya, Aichi 4648603, Japan