Tin(IV) Chloride Promoted Reaction of Oxiranes with Hydrogen Peroxide
摘要:
A group of substituted oxiranes were readily transformed to the corresponding beta-hydroxyhydroperoxides (HHP) in good yields in ethereal SnCl4-H2O2 system in which SnCl4 acts as catalyst. Alternatively, treating oxiranes with SnCl4 first, followed by addition of ethereal H2O2 solution achieved primary gem-dihydroperoxides (DHP) in moderate yields. In the case of preparing DHP, SnCl4 first promoted the rearrangement of oxiranes to aldehydes, followed by condensation with hydrogen peroxide to provide DHP as final products.
Aldehydes were efficiently converted directly into the corresponding gem-dihydroperoxides (DHPs) on treatment with aqueous 70% H2O2 in a biphasic system with ether catalyzed by camphorsulfonic acid. The synthesis represents the most versatile access to this class of compounds.
醛被有效直接转化为相应的宝石上治疗用含水70%H -dihydroperoxides吡啶类(DHP)2 Ô 2中的两相体系与由樟脑磺酸催化的醚。合成代表了此类化合物最通用的获取途径。
Synthesis and Antimalarial Activity of Novel Medium-Sized 1,2,4,5-Tetraoxacycloalkanes
CsOH- or Ag2O-mediated cycloalkylation of (alkylidene)bisperoxides 3 and 1,n.-dihaloalkanes (n = 3-8) provided the corresponding medium-sized 1,2,4,5-tetraoxacycloalkanes 4-8 in moderate yields. Subsequent evaluation of the antimalarial activity of the cyclic peroxides 4-8 in vitro and in vivo revealed that 1,2,6,7-tetraoxaspiro [7.11]nonadecane 4a has considerable potential as a new, inexpensive, and potent antimalarial drug.