Ozonolysis of bis-endo-diacylbicyclo[2.2.1]heptenes in dichloromethane–methanol
作者:Hui-Chang Lin、Chu-Chung Lin、Hsien-Jen Wu
DOI:10.1016/j.tet.2011.07.055
日期:2011.9
lo[2.2.1]heptenes 3a–d at −78 °C in dichloromethane–methanol gave the hydroperoxides 6a–d in 70–80% yields. Ozonolysis of bis-endo-diacetylbicyclo[2.2.2]octene 15 and bis-endo-diacetyl-7-oxabicyclo-[2.2.1]heptene 16 under the same reaction conditions gave the hydroperoxides 17 and 18, respectively. The intramolecular sequential nucleophilic addition of the carbonyl groups to the carbonyl oxide group
Synthesis of Tetraacetal Pentaoxa-Cages and Convex Oxa-Cages by Ozonolysis of 7-Oxabicyclo[2.2.1]heptenes
作者:Chu-Chung Lin、Hsien-Jen Wu
DOI:10.1055/s-1996-4291
日期:1996.6
Tetraacetal pentaoxa-cage compounds 4a and 4b and convex oxa-cage compounds 6, 7 and 8 are synthesized from alkylfurans in three steps. Ozonolysis of the endo adducts 2a and 2b in dichloromethane at -78°C followed by reduction with dimethyl sulfide gave the tetraacetal pentaoxa-cages 4a and 4b in 85-90% yields, respectively. Ozonolysis of 2a and 2b in dichloromethane at -78°C followed by treatment with triethylamine gave the convex oxa-cages 6, 7 and 8 in 85-90% yields, respectively. The synthesis of the tetraacetal pentaoxa-cage 12, possessing aromatic substituents directly on the skeleton of the oxa-cages, has also been accomplished.