Methyl 4-hydroxy-E-2-alkenoates prepared from aldehydes in one step, undergo the Michael reactions with thiolate anions to give 4-alkanolide derivatives, which are converted into 2-alken-4-olides. Methyl 4-methanesulfonyloxy-E-2-alkenoates undergo the substitution reactions, and subsequent treatments give methyl E,E-2,4-alkadienoates.
从
醛类一步制备的甲基
4-羟基-E-2-烯酸酯与
硫醇阴离子发生迈克尔反应,生成4-烷烯内酯衍
生物,这些衍
生物转化为2-烯-4-内酯。甲基4-
甲烷磺酰氧基-E-2-烯酸酯发生取代反应,随后处理得到甲基E,E-2,4-烯二烯酸酯。