All geometrical isomers of heptacosa-11,13-dienes, 1-4, previously identified in termite Prorhinotermes simplex cuticular hydrocarbons, were efficiently synthesized according Peterson-Hudrlik olefination procedure in high stereoisomeric purity using syn and anti elimination of erythro alkenyl-β-hydroxysilanes (15 and 17). These (Z)- and (E)-alkenyl-β-hydroxysilanes are available from regioselective opening of (1R*,2S*)-1,2-epoxy-1-trimethylsilylpentadecane 13 with corresponding (Z)- and (E)-dodec-1-enyl cuprates (14 and 16). Stereoisomeric purity of obtained dienes 1-4 was higher than 95% (13C NMR).
在白蚁Prorhinotermes simplex的角质质地的烃中先前已识别出的七十二碳-11,13-二烯的所有几何异构体1-4,根据Peterson-Hudrlik烯烃化学方法,使用erythro烯基-β-羟基硅烷(15和17)的syn和anti消除,高立体异构纯度地有效合成。这些(Z)-和(E)-烯基-β-羟基硅烷可从相应的(Z)-和(E)-十二碳烯基铜酸盐(14和16)的区域选择性开放(1R*,2S*)-1,2-环氧-1-三甲基硅基十五烷13获得。所得到的二烯1-4的立体异构纯度高于95%(13C NMR)。