The one-pot, multi-component construction of highly substituted tetrahydropyran-4-ones using the Maitland–Japp reaction
作者:Paul A. Clarke、William H. C. Martin、Jason M. Hargreaves、Claire Wilson、Alexander J. Blake
DOI:10.1039/b508252h
日期:——
A one-pot, multi-component reaction for the synthesis of highly substituted tetrahydropyran-4-ones, based on the long forgotten MaitlandâJapp reaction has been realised. Two different aldehydes and a derivative of a β-ketoester can be condensed regioselectively in the presence of a Lewis acid to form tetrahydropyran-4-ones in excellent yields. The diastereoselectively of the reaction was found to be dependant upon the nature of the Lewis acid and the temperature at which the reaction was carried out. This procedure was also extended to the formation of tetrahydropyran-4-ones in greater than 95% enantiomeric excess.
在被人们遗忘已久的 MaitlandâJapp 反应的基础上,一种用于合成高度取代的四氢吡喃-4-酮的单锅多组分反应得以实现。在路易斯酸的作用下,两种不同的醛和δ-酮的衍生物可以选择性地缩合生成四氢吡喃-4-酮,产量极高。研究发现,反应的非对映选择性取决于路易斯酸的性质和反应的温度。该方法还可用于生成对映体过量率超过 95% 的四氢吡喃-4-酮。