Elektrochemische reduktive dimerisierung und claisen-umlagerung
摘要:
The electrochemical reduction of substituted allyl acrylates in acetonitrile in the presence of chlorotrimethylsilane leads to bis-ketenacetals, which undergo Claisen rearrangements to 2,5-diallyl-adipic acid.
γ-Lactone Formation in the Addition of Benzenesulfonyl Bromide to Diene and Enyne Esters
摘要:
The gem-dialkyl effect has been used to promote the formation of functionalized gamma-lactones in the addition of benzenesulfonyl bromide to diene and enyne esters. Introduction of 3 mol % of pyridine into the reactions increases the yields of lactones produced from tertiary esters. Formation of the C-alpha-C-beta bond of gamma-lactones has been achieved in both C-alpha-->C beta and C-beta-->C-alpha radical cyclization directions.