Iodovinylidene lactone synthesis. Free radical cyclisation of iodoacetylenic esters
作者:Gerald Haaima、Rex T. Weavers
DOI:10.1016/0040-4039(88)85342-5
日期:1988.1
Propiolic acids add to alkenes in the presence of N-iodosuccinimide to give iodo acetylenic esters. These, on treatment with dibenzoyl peroxide, undergo cyclisation to yield (E)-iodovinylidene butyrolactones. Subsequent alkylation with lithium dimethylcuprate occurs by replacement of the iodine.
作者:Gerald Haaima、Mary-Jeanne Lynch、Anne Routledge、Rex T. Weavers
DOI:10.1016/s0040-4020(01)87132-5
日期:1991.1
The iodoalkylidene lactones formed by reaction of alkenes with acetylenic acids in the presence of N-iodosuccinimide and subsequent free radical cyclisation, can be de-iodinated photochemically or alkylated with lithiumdiorganocuprate reagents to yield a variety of α-alkylidene lactones.
De-iodination and isomerisation of iodoalkylidene lactones
作者:Gerald Haaima、Anne Routledge、Rex T. Weavers
DOI:10.1016/s0040-4039(01)93474-4
日期:——
The (E)-iodoalkylidene lactones which can be formed by reaction of an alkene with N-iodosuccinimide and an acetylenic acid with subsequent free-radical cyclisation, are readily transformed into iodine free alkylidene lactones by photolysis. Under different reaction conditions, the photolyses yield mixtures of (E) and (Z)-iodovinylidene lactones.
Reaction of iodoalkylidene lactones with nucleophiles
作者:Gerald Haaima、Simon D. Mawson、Anne Routledge、Rex T. Weavers
DOI:10.1016/s0040-4020(01)87032-0
日期:1994.3
replacement of iodide from iodoalkylidene lactones provides a route to a variety of substituted alkylidene lactones. Trifluoromethyl, azido and phenylthio substituted systems are particularly accessible and reaction generally proceeds with predominant retention of the double bond configuration. A detailed GLC study of the stereoselectivity of phenylthiomethylene substitution is described. Reaction with