Tandem Intramolecular Diels-Alder (Timda) Reactions: Branched Substrate Studies and New Synthetic Pathways
作者:Michael A. Brodney、Justin P. O'Leary、Jeffrey A. Hansen、Raymond J. Giguere
DOI:10.1080/00397919508011386
日期:1995.2
Abstract Using a malonic ester route, the first branched tandem intramolecular Diels-Alder (TIMDA) precursor, 3, was synthesized from sorbic acid in seven steps (15% overall yield). Treatment with Lewis acid catalysts (e.g., boron trifluoride etherate) affects the TIMDA reaction to afford a new fused-tetracyclic, 4, as two diastereomers (1:1). An alternative synthetic route to key intermediates used in
摘要 使用丙二酸酯路线,第一个支链串联分子内狄尔斯-阿尔德 (TIMDA) 前体 3 是由山梨酸分七步合成的(总产率为 15%)。用路易斯酸催化剂(例如,三氟化硼醚合物)处理会影响 TIMDA 反应以提供新的稠合四环 4,作为两种非对映异构体 (1:1)。用于合成线性 TIMDA 前体的关键中间体的替代合成路线也已实现。