Oxidatively generated electrophiles as initiators of epoxide cascade cyclization processes
摘要:
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.
Oxidatively generated electrophiles as initiators of epoxide cascade cyclization processes
摘要:
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.