Anionic ring expansion reactions of oxabicyclo[4.2.1]heptenones. An efficient entry into the carbon framework of oxygenated cembranoids
作者:Qing Xu、Mahika Weeresakare、Jon D. Rainier
DOI:10.1016/s0040-4020(01)00778-5
日期:2001.9
Abstract Oxabicyclo[2.2.1]heptenones undergo 2-carbon ring expansion reactions when subjected to anionic condensations and Michael acceptors. They also undergo condensation, fragmentation, and elimination reactions in their anionic couplings with aldehydes. As an outgrowth of this interesting chemistry, we have been able to access the carbon skeleton of oxygenated cembranoids by subjecting bis-activated
摘要 氧杂双环[2.2.1]庚烯酮在阴离子缩合和迈克尔受体作用下会发生2-碳扩环反应。它们在与醛的阴离子偶联中也会发生缩合、裂解和消除反应。作为这种有趣化学的产物,我们已经能够通过将双活化的烯-炔 39 与氧杂双环 [2.2.1] 庚烯酮 1 的烯醇化物处理来获得氧化 cembranoids 的碳骨架。