A Concise Synthesis of<i>R</i>-(-)-Cicutoxin, a Natural 17-Carbon Polyenyne
作者:Benjamin W. Gung、Ann O. Omollo
DOI:10.1002/ejoc.200801172
日期:2009.3
A concisesynthesis of the naturalpolyenyne R-(-)-cicutoxin (1) is described. After several trials, the successful synthesis commenced with three key fragments, R-(-)-1-hexyn-3-ol (8), 1,4-diiodo-1,3-butadiene (9), and the THP protected 4,6-heptadiyn-1-ol (6). Sonogashira coupling of compound 9 with acetylenes 6 and 8 gave the 17-carbon frame, which upon regio-selective reduction of a triple bond
An Iterative Procedure for the Synthesis of Conjugated ψ-Chlorotrienoic and -tetraenoic Esters and Related Derivatives
作者:Margarita Mladenova、Maya Tavlinova、Momcho Momchev、Mouâd Alami、Michèle Ourévitch、Jean Daniel Brion
DOI:10.1002/ejoc.200300110
日期:2003.7
An iterative stereoselective procedure for the synthesis of isomers of conjugated ψ-chlorotrienoic esters and ψ-chlorotetraenoic esters as well as related conjugated ψ-chloropolyenynoic esters is described, using readily available conjugated chlorodienol and chloroenynol derivatives as starting materials. The two-step sequence studied is based on repetition of a one-pot conjugated allylic alcohol oxidation/Wittig