A convenient synthesis of 3,4-didehydroretinal was developed. The Horner–Emmons reaction between 3,4-didehydro-β-ionone and diphenyl phosphonate in the presence of crown ether gave the retinonitrile as an isomeric mixture, in which the newly produced double bond was predominantly 11Z-form. After separation of the 11Z-form retinonitrile, it was converted into the corresponding retinal in good yield without isomerization of the double bonds.
开发出了一种简便的 3,4-二脱氢
视黄醛合成方法。在
冠醚存在下,3,4-二脱氢-β-酮与
膦酸二苯酯发生 Horner-Emmons 反应,生成视黄腈异构混合物,其中新生成的双键主要为 11Z 形式。在分离出 11Z 形式的
视黄醛腈后,可以将其转化为相应的
视黄醛,且收率很高,不会发生双键异构化。