Acid-catalyzed intramolecular ring-opening reactions of cyclopropanated oxabenzonorbornadienes with alcohol nucleophiles
作者:Christopher Wicks、Samuel Koh、Austin Pounder、Emily Carlson、William Tam
DOI:10.1016/j.tetlet.2019.151228
日期:2019.11
An investigation of intramolecular ring-opening reactions of various cyclopropanated oxabenzonorbornadienes (CPOBDs) with alcohol nucleophiles is reported, which forms two regioisomeric products in good yields. The effect of various tether lengths was explored, wherein increasing the alcohol tether length to 4 or 5 carbons exclusively generated Type 3 products in good yield, while C-1-hydroxymethyl
报道了对各种环丙烷化的氧杂苯并降冰片二烯(CPOBD)与醇亲核试剂的分子内开环反应的研究,该反应以高收率形成了两种区域异构产物。探索了各种不同的系链长度的影响,其中将醇系链长度增加到4个或5个碳专门以高收率生成3型产物,而C-1-羟甲基取代的CPOBD以极好的收率形成1,3,5-环庚三烯衍生物。给电子芳烃和吸电子C-5桥头取代基形成了3型主要产物,而吸电子芳烃和给电子C-5取代基优先提供了2型化合物。还提出了形成两种区域异构产物的机制。