92362-19-1Relevant articles and documents
Organoselenium mediated asymmetric cyclizations. Synthesis of enantiomerically pure 1,6-dioxaspiro[4.4]nonanes
Tiecco, Marcello,Testaferri, Lorenzo,Bagnoli, Luana,Scarponi, Catalina,Temperini, Andrea,Marini, Francesca,Santi, Claudio
, p. 2768 - 2774 (2007/10/03)
The asymmetric cyclization of 1-hydroxyoct-7-en-4-one, promoted by camphorselenenyl tetrafluoroborate, generated from camphor diselenide and silver tetrafluoroborate in dichloromethane at room temperature, afforded a mixture of two diastereoisomeric E- and two diastereoisomeric Z-2-[(camphorseleno)methyl]-1,6-dioxaspiro[4.4]nonanes. These were separated by medium pressure liquid chromatography and then deselenenylated with triphenyltin hydride and AIBN to give enantiomerically pure 2-methyl-1,6-dioxaspiro[4.4]nonanes. The camphorseleno group was also substituted by an allyl function using allyltributyltin in the presence of AIBN.
ALKOXY RADICALS IN ORGANIC SYNTHESIS. A NOVEL APPROACH TO SPIROKETALS
Kraus, George A.,Thurston, Jeff
, p. 4011 - 4014 (2007/10/02)
Photolysis of an unsaturated alcohol in the presence of HgO and iodine generates an alkoxy radical which can cyclize to form a five-membered ring ether.If a hemiketal is employed, a spiroketal can be formed in good yield.