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