A convenient access to (3S)-3-(triisopropylsilyl)oxy-1-pyrroline N-oxide, a useful intermediate for polyfunctionalized enantiopure indolizidine and pyrrolizidine synthesis
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Goti, A
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Univ Florence, Dipartimento Chim Organ Ugo Schiff, CNR, CSCEA, I-50121 Florence, ItalyUniv Florence, Dipartimento Chim Organ Ugo Schiff, CNR, CSCEA, I-50121 Florence, Italy
Goti, A
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Cacciarini, M
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Cardona, F
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Brandi, A
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Univ Florence, Dipartimento Chim Organ Ugo Schiff, CNR, CSCEA, I-50121 Florence, ItalyUniv Florence, Dipartimento Chim Organ Ugo Schiff, CNR, CSCEA, I-50121 Florence, Italy
Brandi, A
[1
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[1] Univ Florence, Dipartimento Chim Organ Ugo Schiff, CNR, CSCEA, I-50121 Florence, Italy
Optimization of a strategy providing the enantiomerically pure nitrone 2 in five steps and 28% overall yield from L-malic acid has been achieved by the combined use of DIBAL-H as the reductant and triisopropylsilyl as the protecting group. The utility of nitrone 2 as synthetic intermediate is demonstrated by a ready access to polyhydroxylated indolizidines and pyrrolizidines via stereoselective 1,3-dipolar cycloaddition reactions. (C) 1999 Elsevier Science Ltd. All rights reserved.
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Univ Florence, Dipartimento Chim Organ Ugo Schiff, Polo Sci, I-50019 Sesto Fiorentino, FI, ItalyUniv Florence, Dipartimento Chim Organ Ugo Schiff, Polo Sci, I-50019 Sesto Fiorentino, FI, Italy
Pisaneschi, F
Della Monica, C
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Univ Florence, Dipartimento Chim Organ Ugo Schiff, Polo Sci, I-50019 Sesto Fiorentino, FI, ItalyUniv Florence, Dipartimento Chim Organ Ugo Schiff, Polo Sci, I-50019 Sesto Fiorentino, FI, Italy
Della Monica, C
Cordero, FM
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Univ Florence, Dipartimento Chim Organ Ugo Schiff, Polo Sci, I-50019 Sesto Fiorentino, FI, ItalyUniv Florence, Dipartimento Chim Organ Ugo Schiff, Polo Sci, I-50019 Sesto Fiorentino, FI, Italy
Cordero, FM
Brandi, A
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Univ Florence, Dipartimento Chim Organ Ugo Schiff, Polo Sci, I-50019 Sesto Fiorentino, FI, ItalyUniv Florence, Dipartimento Chim Organ Ugo Schiff, Polo Sci, I-50019 Sesto Fiorentino, FI, Italy