A Trialkylphosphine-Derived Palladacycle as a Catalyst in the Selective Cross-Dimerization of Terminal Arylacetylenes with Terminal Propargyl Alcohols and Amides
作者:Matthew G. Lauer、Benjamin R. Headford、Olivia M. Gobble、Michelle B. Weyhaupt、Deidra L. Gerlach、Matthias Zeller、Kevin H. Shaughnessy
DOI:10.1021/acscatal.6b01541
日期:2016.9.2
aryl alkynes with propargyl alcohols to afford linear (E)-enynol products is reported. The complex [Pd(μ-κ2-O,O-OAc)(κ2-C,P-(t-Bu)2PCH2C(Me)2CH2)]2 selectively affords (E)-5-aryl-2-en-4-yn-1-ol products in good yields under mild conditions with high chemo-, regio-, and stereoselectivity. In contrast, previously reported examples of this reaction afford the branched 4-aryl-2-hydroxymethanol-1-buten-3-yne
报导了一种用于使末端芳基炔烃与炔丙醇选择性交联二聚以提供线性(E)-烯醇产物的方法。络合物[钯(μ-κ 2 - O,O- OAC)(κ 2 - C,P - (吨-Bu)2 PCH 2 C(Me)的2 CH 2)] 2选择性地得到(Ë)-5-芳基-2-en-4-yn-1-ol产品在温和条件下具有高收率,高化学选择性,区域选择性和立体选择性。相反,该反应的先前报道的实例提供了支链的4-芳基-2-羟基甲醇-1-丁烯-3-炔。炔丙基酰胺也选择性地二聚,但是对于线性烯炔具有较低的区域选择性。该方法已用于合成(E)-5-苯基-2-戊烯-4-yn-1ol,它是2型糖尿病候选药物NNC 61-4655的前体,由苯乙炔和炔丙基得到的收率为72%。酒精。与芳基炔的环钯预催化剂进行反应,得到二聚钯环复合物的第一个例子具有μ-κ 2 - c ^ 1,c ^ 1结合的乙炔配体。在催化反应期间观察到该络合物,它是有效的预催化剂。