SEARCH Articles Figures Tables Cyclization natural products synthesis Cyclization oxygen nucleophiles Cyclization oxygenative Cyclization product Cyclizations synthesis Natural product synthesis 3 + 2] cyclizations Natural products, synthesis Nucleophile oxygen Nucleophilic cyclizations Nucleophilic oxygen OXYGEN product Oxygen nucleophiles Oxygen nucleophiles natural products synthesis Oxygen production Oxygenated nucleophiles Oxygenated products Oxygenates synthesis Synthesis cyclization