PdCl<sub>2</sub>-Catalyzed Two-Component Cross-Coupling Cyclization of 2,3-Allenoic Acids with 2,3-Allenols. An Efficient Synthesis of 4-(1‘,3‘-Dien-2‘-yl)-2(5<i>H</i>)-furanone Derivatives
作者:Shengming Ma、Zhenhua Gu
DOI:10.1021/ja0500815
日期:2005.5.1
Cross-coupling cyclization reaction between 2,3-allenoic acids 1 and 2,3-allenols 2, in which two allenes functioned differently, was realized to afford 4-(1',3'-dien-2'-yl)-2(5H)-furanone derivatives 3. The reaction may proceed via an oxypalladation, insertion, and beta-hydroxide elimination process. A high E-stereoselectivity of the new formed C=C double bond was observed.
实现了 2,3-丙烯酸 1 和 2,3-丙烯醇 2 之间的交叉偶联环化反应,其中两个丙二烯的功能不同,得到 4-(1',3'-dien-2'-yl)-2 (5H)-呋喃酮衍生物 3. 反应可以通过羟基钯化、插入和β-氢氧化物消除过程进行。观察到新形成的 C=C 双键的高 E 立体选择性。