Aerobic Organocatalytic Photoinitiated Arene Oxidations: Application to Electron Transfer Initiated Cyclization Reactions
作者:V. Satish Kumar、Danielle L. Aubele、Paul E. Floreancig
DOI:10.1021/ol016996f
日期:2001.12.1
[reaction: see text] Electrontransfer initiated oxidative cyclization reactions can be effected by catalytic amounts of N-methylquinolinium hexafluorophosphate through photoirradiation in the presence of dioxygen. Solid sodium thiosulfate serves as an effective reducing agent to remove the reactive oxygen species formed from catalyst regeneration and radical coupling reactions with O(2), allowing
Oxidatively generated electrophiles as initiators of epoxide cascade cyclization processes
作者:V. Satish Kumar、Shuangyi Wan、Danielle L. Aubele、Paul E. Floreancig
DOI:10.1016/j.tetasy.2005.08.055
日期:2005.10
Oxidatively generated oxocarbenium ions are shown to be effective promoters of polyepoxide cascade cyclization reactions to form polyether compounds. The reaction conditions are neutral, ensuring that background acid-mediated processes are not operative and that other acid-sensitive functional groups, such as acetals, can be incorporated into cyclization substrates. While 5-exo pathways are more common that 6-endo pathways, a rational design has been employed to access tetrahydropyranyl ethers. (c) 2005 Elsevier Ltd. All rights reserved.