Cyclization-Carbonylation-Cyclization Coupling Reactions of Propargyl Acetates and Amides with Palladium(II)-Bisoxazoline Catalysts
作者:Sumie Yasuhara、Makiko Sasa、Taichi Kusakabe、Hiroyuki Takayama、Masayuki Kimura、Tomoyuki Mochida、Keisuke Kato
DOI:10.1002/anie.201008139
日期:2011.4.18
Clever boxing: A cyclization–carbonylation–cyclization–coupling reaction of propargyl acetates 1 or amides 2 in the presence of a palladium(II)–bisoxazoline (box) catalyst afforded symmetrical ketones of types 3 and 4, respectively, containing two heterocyclic groups in moderate to excellent yields (see scheme; tfa=trifluoroacetate). Compounds 3 were converted into ketones containing two 3(2H)‐furanone
聪明的装箱:在钯(II)-双恶唑啉(盒)催化剂的存在下,炔丙基乙酸酯1或酰胺2的环化-羰基化-环化-偶联反应分别得到3和4型对称的酮,在其中含有两个杂环基中度至优异的收率(参见方案; tfa =三氟乙酸盐)。将化合物3转化为含有两个3(2 H)-呋喃酮环的酮。