Direct Preparation of (Z,Z)-1,4-Dienic Units with a New C6 Homologating Agent: Synthesis of α-Linolenic Acid
作者:Jacqueline Sandri、Jacques Viala
DOI:10.1055/s-1995-3906
日期:1995.3
Syntheses of two C6 homologating agents 2a and 2f are described. These agents allow direct access to the (Z,Z)-1,4-diene unit 3, a moiety present in a wide number of natural compounds. Compound 2a is prepared in 40% overall yield by selective epoxidation of methoxycyclohexa-1,4-diene followed by oxidative ring cleavage and transacetalization. Compound 2f is obtained in 90% yield by a one-step oxidative dimerization of phosphonium salt 1. A short synthetic application of these two new C6 homologating agents to the synthesis of α-linolenic acid is described.
描述了两种C6同源试剂2a和2f的合成。这些试剂可以直接获得(Z,Z)-1,4-二烯单元3,而该单元在许多天然化合物中存在。化合物2a通过选择性环氧化甲氧基环己烯-1,4-二烯,随后进行氧化断环和转醛化,最终以40%的总收率制备而成。化合物2f通过磷盐1的一步氧化二聚反应获得,收率为90%。还描述了这两种新C6同源试剂在合成α-亚麻酸中的简短合成应用。