Selective Intramolecular Oxyselenenylation of Olefinic Alcohols and Carboxylic Acids by Using Organic Cyanoselenides in the Presence of Metal Triflates
摘要:
The reagent, ArSeCN-M(OTf)(n), is prepared from equimolar amounts of an aromatic selenocyanate and metal trifluoromethanesulfonate. It reacts with unsaturated alcohols and carboxylic acids to give cyclic ethers and lactones, respectively. Depending on conditions, reactions of trans-2-allylcyclohexanol with the reagent selectively afford exo-cyclized tetrahydrofuran or endo-cyclized tetrahydropyran. The mechanism of exo/endo selection is discussed based on molecular dynamics studies.