Single-Flask Multicomponent Synthesis of Highly Substituted α-Pyrones via a Sequential Enolate Arylation and Alkenylation Strategy
作者:Michael Grigalunas、Olaf Wiest、Paul Helquist
DOI:10.1021/acs.orglett.6b02969
日期:2016.11.4
Trisubstituted α-pyrones are obtained by a Pd-catalyzed three-component, single-flask operation via an α-arylation, subsequent α-alkenylation, alkene isomerization, and dienolate lactonization. A variety of coupling components under mild conditions afforded isolated yields of up to 93% of the pyrones with complete control of regioselectivity. Metal dependence was noted for three of the steps of the
三取代的α-吡喃酮通过Pd催化的三组分单瓶操作,通过α-芳基化,随后的α-烯基化,烯烃异构化和二烯酸酯内酯化而获得。在温和条件下,各种偶联组分可提供高达93%的吡喃酮分离产率,并能完全控制区域选择性。在该路径的三个步骤中都发现了金属依赖性。通过进一步的转化证明了吡喃酮产品的效用,进一步的转化提供了对聚芳族化合物的方便使用,展现出广泛的分子多样性。