反应详情

In a process for the synthesis of 2-(6-carbomethoxy-cis-hexenyl)-cyclopentane-1,3,4-trione by stepwise converting 2-methyl-2-(3-butynyl)-1,3-dioxolane to 9-oxo-5-decynoic acid, esterifying that acid to methyl 9-oxo-5-decynoate, reducing the latter to 9-oxo-cis-5-decenoate, condensing the methyl 9-oxo-cis-5-decenoate with diethyl oxalate to obtain 2-(6-carbomethoxy-cis-2-hexenyl)-5-ethoxalyl-cyclopentane-1,3,4-trione as an intermediate, and hydrolyzing the intermediate to obtain 2-(6-carbomethoxy-cis-hexenyl)-cyclopentane-1,3,4-trione, the improvement which comprises: