Esters of 2,4-dien-6-ynoic acids were prepared from terminal acetylenes by lithiation, 1,2-addition to acrolein, orthoester Claisen–Johnson rearrangement and α-(4-methoxyphenyl)selenation/oxidative elimination to introduce the α,β-unsaturation.
由末端
乙炔通过
锂化,1,2-加成
丙烯醛,原酸酯Claisen-Johnson重排和α-(4-
甲氧基苯基)
硒化/氧化消除以引入α,而制得2,4-二烯-6-炔酸的酯β-不饱和。