The nitrone then undergoes an intramolecular 1,3-dipolar cycloaddition. This means that the nitrone's double bond can react with an adjacent dipolarophile within the same molecule. In the case of a condensed cyclopentane system, the dipolarophile is typically another alkene within the same molecule.
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((2R,3S)-3-Amino-2-ethynyl-4-oxo-azetidin-1-yl)-(2-methyl-[1,3]dioxolan-2-yl)-acetic acid benzyl ester
(2RS,5SR,6SR)-benzyl 4,7-dioxo-6-phenoxyacetamido-1,3-diazabicyclo<3.2.0>heptane-2-carboxylate
(3'S,17S)-3'-methyl-2'-(4-methoxyphenyl)-3',4'-dihydro-2'H-pyrazolo[4',5':17,16]androst-5-ene 3β-acetate
C26H29N3O10S
