Ring enlargement reaction of 2-(1-alkenyl)-1-cyclobutyl ketones. A new method for the preparation of 4-acyl-1-cyclohexenes
作者:Tooru Fujiwara、Takeshi Takeda
DOI:10.1016/s0040-4039(00)98020-1
日期:1990.1
Various 1,2-disubstituted 4-acyl-1-cyclohexenes were obtained by the ethylaluminum dichloride promoted ringenlargement reaction of 2-(1-alkenyl)-1-cyclobutyl ketones prepared by the conjugate addition of 1-alkenylmagnesium bromides With 1-cyclobutenyl ketones.
Diels–Alder/thiol–olefin co-oxygenation approach to antimalarials incorporating the 2,3-dioxabicyclo[3.3.1]nonane pharmacophore
作者:Paul M. O’Neill、Edite Verissimo、Stephen A. Ward、Jill Davies、Edward E. Korshin、Nuna Araujo、Matthew D. Pugh、M. Lurdes S. Cristiano、Paul A. Stocks、Mario D. Bachi
DOI:10.1016/j.bmcl.2006.02.059
日期:2006.6
A Diels-Alder/thiol-olefin co-oxygenation approach to the synthesis of novel bicyclic endoperoxides 17a-22b is reported. Some of these endoperoxides (e.g., 17b, 19b, 22a and 22b) have potent nanomolar in vitro antimalarial activity equivalent to that of the synthetic antimalarial agent arteflene. Iron(II)-mediated degradation of sulfone-endoperoxide 19b and spin-trapping with TEMPO provide a spin-trapped