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Cycloaddition Reactions of C,N-Diphenylnitrone to Methylene-γ-butyrolactones
Dipartimento di Chimica Organica "Ugo Schiff", Centro di studio sulla Chimica e la Struttura dei Composti Eterociclici e loro Applicazioni (CSCEA) C. N. R., Università di Firenze, via G. Capponi 9, I-50121 Firenze, Italy
* Author to whom correspondence should be addressed.
Received: 6 March 2000; Accepted: 21 March 2000 / Published: 2 April 2000
Abstract: Cycloaddition of C,N-diphenylnitrone to α-methylene-γ-butyrolactone afforded two diastereomeric 5-spirosubstituted isoxazolidines with high selectivity. Structural assignment was ascertained by NMR studies and an X-ray diffraction experiment on a single crystal of the major isomer and the diastereoselectivity was rationalized on examination of the alternative transition states leading to the two diastereoisomers.
Keywords: Nitrones; lactones; 1; 3-dipolar cycloaddition; stereoselectivity; regioselectivity
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Cacciarini, M.; Cordero, F.M.; Faggi, C.; Goti, A. Cycloaddition Reactions of C,N-Diphenylnitrone to Methylene-γ-butyrolactones. Molecules 2000, 5, 637-647.
Cacciarini M, Cordero FM, Faggi C, Goti A. Cycloaddition Reactions of C,N-Diphenylnitrone to Methylene-γ-butyrolactones. Molecules. 2000; 5(4):637-647.
Cacciarini, Martina; Cordero, Franca M.; Faggi, Cristina; Goti, Andrea. 2000. "Cycloaddition Reactions of C,N-Diphenylnitrone to Methylene-γ-butyrolactones." Molecules 5, no. 4: 637-647.