A Synthetic Alternative to the Type-II Intramolecular 4 + 3 Cycloaddition Reaction
作者:Richard S. Grainger、Richard B. Owoare、Patrizia Tisselli、Jonathan W. Steed
DOI:10.1021/jo034356f
日期:2003.10.1
Oxyallyl cations generated in situ from dihaloketones have been found to undergo the Favorskii rearrangement in preference to an intramolecular Type-II 4 + 3 cycloaddition reaction in trifluoroethanol and hexafluoropropan-2-ol solvents, generating acrylate esters with high cis selectivity. A synthetic alternative to the intramolecular Type-II 4 + 3 cycloaddition has been developed on the basis of intramolecular
已经发现,由二卤代酮原位生成的羟基烯丙基阳离子优先于三氟乙醇和六氟丙烷-2-醇溶剂中的II- 4 + 3型分子内环加成反应发生Favorskii重排,生成具有高顺式选择性的丙烯酸酯。基于分子内烯醇化烷基化以闭合具有外环双键的7元环的分子内II-型4 + 3环加成的合成替代物。