STEREOSELECTIVE SYNTHESIS OF 3a,4,5,7a-TETRAHYDRO-5,7a-ETHANOPHTHALIDE DERIVATIVES USING SUCCESSIVE INTRA- AND INTERMOLECULAR DIELS–ALDER REACTIONS
作者:Michihiko Noguchi、Shinji Kakimoto、Shoji Kajigaeshi
DOI:10.1246/cl.1985.151
日期:1985.2.5
moieties underwent the intramolecular Diels–Alder reaction followed by the extrusion of carbon dioxide to give 3a, 4-dihydrophthalide derivatives. The dihydrophthalides added to the second dienophiles intermolecularly to give 3a,4,5,7a-tetrahydro-5,7a-ethanophthalide derivatives. The stereoselectivity of the 5,7a-ethanophthalides was liable for the two successive reactions.
一些在酯部分带有适当亲二烯体的 2-pyrone-6-羧酸酯经历了分子内 Diels-Alder 反应,然后挤出二氧化碳得到 3a, 4-dihydrophthalide 衍生物。将二氢邻苯二甲醚分子间加到第二个亲二烯体中,得到 3a,4,5,7a-四氢-5,7a-乙苯酞衍生物。5,7a-乙酰苯酞的立体选择性有利于两个连续反应。