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This review describes ylide 1,3-dipoles in cycloaddition reactions for the synthesis (and formal synthesis) of natural products. Examples using azomethine ylides, carbonyl ylides, nitrones, nitronates, nitrile oxides and azides are provided. These lead to a diverse array of heterocyclic products. Intramolecular cycloaddition provides two new rings in one step and hence an efficient entry to complex target compounds.