1,3-Dipolar cycloadditions of 2-deoxy-D-ribose-derived L-threo five-membered cyclic nitrone to alpha,beta-unsaturated gamma- and delta-lactones were investigated. Cycloadducts obtained from d-lactones, after N-O bond cleavage, opening of the lactone ring, and protection of hydroxyl groups were subjected to beta-lactam ring formation by using Mukaiyama's salt. Cycloadducts from gamma-lactones subjected to the same reaction sequence undergo beta-elimination of a water molecule to provide pyrrolidine-substituted unsaturated gamma-lactones. (C) 2016 Elsevier Ltd. All rights reserved.
机构:Univ Florence, CNR, Ctr Composti Eterociclici, Dipartimento Chim Organ U Schiff, I-50121 Florence, Italy
Jurczak, M
Rabiczko, J
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机构:Univ Florence, CNR, Ctr Composti Eterociclici, Dipartimento Chim Organ U Schiff, I-50121 Florence, Italy
Rabiczko, J
Socha, D
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机构:Univ Florence, CNR, Ctr Composti Eterociclici, Dipartimento Chim Organ U Schiff, I-50121 Florence, Italy
Socha, D
Chmielewski, M
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Univ Florence, CNR, Ctr Composti Eterociclici, Dipartimento Chim Organ U Schiff, I-50121 Florence, ItalyUniv Florence, CNR, Ctr Composti Eterociclici, Dipartimento Chim Organ U Schiff, I-50121 Florence, Italy
Chmielewski, M
Cardona, F
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机构:Univ Florence, CNR, Ctr Composti Eterociclici, Dipartimento Chim Organ U Schiff, I-50121 Florence, Italy
Cardona, F
Goti, A
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机构:Univ Florence, CNR, Ctr Composti Eterociclici, Dipartimento Chim Organ U Schiff, I-50121 Florence, Italy
Goti, A
Brandi, A
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机构:Univ Florence, CNR, Ctr Composti Eterociclici, Dipartimento Chim Organ U Schiff, I-50121 Florence, Italy