The Use of Pyrylium Tetrafluoroborate for the Stereoselective Synthesis of 2<i>Z</i>,4<i>E</i>-Dienals
作者:Yuri Y. Belosludtsev、Bennett C. Borer、Richard J. K. Taylor
DOI:10.1055/s-1991-26456
日期:——
The addition of organolithium reagents to pyrylium tetrafluoroborate followed by in situ electrocyclic ring opening of the intermediate 2H-pyrans gives the title Z,E-dienals with high stereoselectivity.
Polyunsaturated aldehydes by direct polyvinylogation of carbonyl compounds using functionalized phosphonates.
作者:Lucette Duhamel、Jérome Guillemonta、Yann Le Gallica、Gérard Plé、Jean-Marie Poirier、Yvan Ramondenc、Pierre Chabardes
DOI:10.1016/s0040-4039(00)94712-9
日期:1990.1
Réactifs de Polyvinylogation : accès aisé et rapide à des Polyénals variés.
作者:Y. Ramondenc、G. Ple
DOI:10.1016/s0040-4020(01)80239-8
日期:1993.1
This work describes the synthesis and the reactivity of three reagents of polyvinylogation 1-3 By condensation with several aldehydes and ketones, these reagents allow the introduction of three or four doubles bonds, leading to polyenals 5-6 in one or two steps with good yields, A thorough study by high field NMR spectroscopy has been realised ; these polyenals show an all trans configuration.
Functionalized vinylic organolithium compounds, synthetic equivalent of ω-lithio sorbaldehyde
作者:L. Duhamel、G. Ple、Y. Ramondenc
DOI:10.1016/s0040-4039(00)70701-5
日期:1989.1
Functional vinylic anions and react with aldehydes and ketones leading after hydrolysis to polyenic aldehydes . They have been used for the synthesis of navenone B .