Yb(OTf)3-catalyzed propargylation and allenylation of 1,3-dicarbonyl derivatives with propargylic alcohols: one-pot synthesis of multi-substituted furocoumarin
作者:Wen Huang、Jialiang Wang、Quansheng Shen、Xigeng Zhou
DOI:10.1016/j.tet.2007.08.114
日期:2007.11
depending on the nature of propargylic alcohols. In addition, catalytic quantities of Yb(OTf)3 can also effectively promote the propargylation and allylation of 4-hydroxycoumarins at the 3-position. By applying this reaction as the key step, a multi-substituted furocoumarin can easily be synthesized in a one-pot procedure. The advantages of this method are broad scope, mild conditions, and easy handling
建立了高效,温和的路易斯酸催化1,3-二羰基化合物与炔丙醇的偶联反应。根据炔丙醇的性质获得选择性的炔丙基化或烯丙基化产物。另外,催化量的Yb(OTf)3还可以有效地促进4-羟基香豆素在3-位的炔丙基化和烯丙基化。通过将该反应作为关键步骤,可以很容易地通过一锅法合成多取代的呋喃香豆素。该方法的优点是适用范围广,条件温和且易于处理,因为水是唯一的副产品。