Alkylation of the peroxyhemiketal function is described and all synthesised endoperoxides show good antimalarial activity. New rearrangement reactions in the presence of CsCO3, and preliminary results on Fe(II) chemical reduction of the O–O bond are presented.
is described. The reaction produced unsaturated endoperoxides, i.e., 1,2-dioxin-3-ols, via resonance stabilized alkenyldiketone radicals. This convenient and eco-friendly reaction was applied to the synthesis of natural phytohormone G3 and its analogs. The obtained 1,2-dioxin-3-ol was easily transformed in several alcohols into the corresponding acetals. In addition, the mechanism for the Mn(III)/Mn(II)
Abstract Naturally occurring derivatives of 2,3-dioxabicyclo [4,4,0] decane from Ecucalyptus grandis have been reported to possess a wide range of biological control in various plants including the parent one. The biogenetic type synthesis of these compounds have been discussed in this Paper.
The natural cyclic peroxide G3 is rearranged in the presence of a RuII–tertiary phosphine complex, to an ene pentadione and to a bicyclic hemiacetal butenolide; the structures have been respectively assigned by CPG–MS analysis and X-ray studies.
天然环状过氧化物 G3 在 RuII-叔膦络合物的存在下重新排列为烯五酮和双环半缩醛丁烯内酯;其结构已分别通过 CPG-MS 分析和 X 射线研究确定。
Synthesis and Electrochemical Studies of New Antimalarial Endoperoxides
Structural analogues of endoperoxides belonging to the family of G factors have been synthesized under Mannich-type conditions. The structures of the different diastereoisomers have been established from NMR spectroscopic data. Their cathodic peak potentials have been determined by thin layer electrochemistry under potentiostatic conditions, and compared to artemisinin. These endoperoxides were evaluated in