Novel Prospects of the Acidic Thermal Rearrangement of Spiro[cyclopropane-1,5′-isoxazolidines] toβ-Lactams
作者:Franca M. Cordero、Maria Salvati、Federica Pisaneschi、Alberto Brandi
DOI:10.1002/ejoc.200300595
日期:2004.5
Monocyclic β-lactams were synthesized by a 1,3-cycloaddition/thermal rearrangement process in the presence of a protic acid, starting from methylenecyclopropane derivatives and acyclic nitrones. Five-membered cyclic nitrones failed to give carbapenam structures under the same conditions, affording exclusively the corresponding N-trifluoroacetyl β-amino acid derivatives in the presence of trifluoroacetic
从亚甲基环丙烷衍生物和无环硝酮开始,在质子酸存在下,通过 1,3-环加成/热重排过程合成单环 β-内酰胺。五元环硝酮在相同条件下未能产生碳青霉烯结构,在三氟乙酸存在下仅提供相应的 N-三氟乙酰基 β-氨基酸衍生物。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)