Diastereoselective [4+2] Reactions of<i>o</i>-Quinone Methides with a Chiral Enol Ether: Asymmetric Synthesis of (+)-<i>R</i>-Mimosifoliol
作者:Thomas R. Pettus、Carolyn Selenski、Lupe H. Mejorado
DOI:10.1055/s-2004-822888
日期:——
The first examples of enantioselective [4+2] cycloadditions of o-quinone methides (o-QMs) are reported. Their cycloaddition with trans-2-phenyl-1-cyclohexanol derived vinyl ether produces chiral benzopyrans. This procedure offers access to chiral aliphatic benzylic carbons and is applied to the synthesis of (+)-R-mimosifoliol.
报道了邻醌甲基化物 (o-QMs) 的对映选择性 [4+2] 环加成反应的第一个例子。它们与反式-2-苯基-1-环己醇衍生的乙烯基醚环加成产生手性苯并吡喃。该过程提供了获得手性脂肪族苄基碳的途径,并应用于 (+)-R-mimosifoliol 的合成。