A new property of geminal bishydroperoxides: Hydrolysis with the removal of hydroperoxide groups to form a ketone
摘要:
A new property of geminal bishydroperoxide was discovered: the ability to hydrolyze in acid medium in the presence of hydrogen peroxide with the formation of ketones. The most resistant to hydrolysis are the cyclic C(6)-bishydroperoxydes: at room temperature within one day they are practically not hydrolyzed; less stable is bishydroperoxycycloheptane (C(7)): in a day its one fifth part is hydrolyzed. Bishydroperoxydes with the cycles of C(8) and C(12) for the same time hydrolyzed to 80 and 90% respectively. Of the two linear bishydroperoxydes, 2,2-dihydroperoxydecane, with sterically unhindered center, is more resistant to hydrolysis than 6,6-dihydroperoxyundecane.
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.