Intramolecular Homolytic Displacements. 24. Simple Access to Glycidic Esters via Induced Decomposition of Peroxyketals Derived from Ethyl 2-(1-Hydroperoxyethyl)propenoate
摘要:
The synthetic potential of the homolytic-induced decomposition of peroxyketals peroxyketals derived from ethyl 2-(1-hydroperoxyethyl)propenoate to access glycidic esters was demonstrated. The propagation step of this free radical chain reaction proceeds via the addition of an alkyl radical to the double bond followed by S(H)i on the peroxidic bond with the production of an oxy radical, regenerating rapidly by beta-elimination the alkyl radical responsible for the induced reaction, These reactions of elimination produce two fragments, an alkyl radical and an ester molecule, from linear ''acetalic'' radical, or they could be isomerizations in the case of cyclanyloxy radicals. In these last cases, the isomerization creates an ester function corresponding to a new protected functionality as aldehyde, acid, or alcohol.
Intramolecular Homolytic Displacements. 24. Simple Access to Glycidic Esters via Induced Decomposition of Peroxyketals Derived from Ethyl 2-(1-Hydroperoxyethyl)propenoate
摘要:
The synthetic potential of the homolytic-induced decomposition of peroxyketals peroxyketals derived from ethyl 2-(1-hydroperoxyethyl)propenoate to access glycidic esters was demonstrated. The propagation step of this free radical chain reaction proceeds via the addition of an alkyl radical to the double bond followed by S(H)i on the peroxidic bond with the production of an oxy radical, regenerating rapidly by beta-elimination the alkyl radical responsible for the induced reaction, These reactions of elimination produce two fragments, an alkyl radical and an ester molecule, from linear ''acetalic'' radical, or they could be isomerizations in the case of cyclanyloxy radicals. In these last cases, the isomerization creates an ester function corresponding to a new protected functionality as aldehyde, acid, or alcohol.
Stereoselectivity of the intramolecular homolytic substitution in the induced decomposition of methacrylic-type peroxidic compounds
作者:Daniel Colombani、Bernard Maillard
DOI:10.1016/0040-4020(96)00914-3
日期:1996.11
The stereochemistry of the oxiranes, obtained by radical induced decomposition of various peroxydic compounds, was determined by NMR spectroscopy. The stereoselectivity of the intramolecular homolytic substitution on the peroxidicbond was discussed in relation to the effect of the reaction temperature and on the influence of structural factors such as the nature of the leaving and attacking radicals