ene-acetals to spontaneously generate 6α-hydroxy-bis-acetals that could serve as precursors for a Cannizzaro-type rearrangement, yielding bis-angularly substitutedcis-fusedlactones. Both the oxidizing reagent, m-CPBA or NaBO 3 , and the substitution pattern can be important in determining the course of the epoxidation/ring-opening sequence, with NaBO 3 being the ideal electrophilic oxidant for the
Mild Protocols for Generating Molecular Complexity: A Comparative Study of Hetero-Domino Reactions Based on the Oxidant and the Substitution Pattern
作者:José I. Candela Lena、Elena M. Sánchez Fernández、Alwar Ramani、Nicolas Birlirakis、Alejandro F. Barrero、Siméon Arseniyadis
DOI:10.1002/ejoc.200400549
日期:2005.2
A bicyclic unsaturated 1,2-diol framework was found to undergo an interesting set of domino reactions on treatment with oxidants. One-pot syntheses of seven-membered-ringcontaining frameworks were achieved by a Pb(OAc)4-mediated domino process, while with other oxidants investigated, such as Mn(OAc)3, Dess–Martin periodinane, PhI(OAc)2, Ph3Bi(CO)3, NaIO4, and NaBiO3, the domino process was interrupted
A further study on Pb(OAc)(4) mediated transformations of bicyclic unsaturated diols leading to conveniently functionalized cycloheptanones is reported.