An efficient palladium(II)-catalyzed oxidative carbohydroxylation of allene-substituted conjugated dienes in aqueous media has been developed. The reaction is conducted employing p-benzoquinone as the stoichiometric reoxidant for the palladium or underaerobicconditions with essentially the same outcome. It is worth mentioning that this is the first example of a palladium(II)-catalyzed oxidation where
已开发出一种高效的钯 (II) 催化的丙二烯取代的共轭二烯在水性介质中的氧化碳羟基化反应。该反应使用对苯醌作为钯的化学计量再氧化剂或在有氧条件下进行,结果基本相同。值得一提的是,这是钯(II)催化氧化的第一个例子,其中在水中形成碳 - 碳键,也是水对(π-烯丙基)钯配合物进行亲核攻击的少数案例之一.
Carbon−Carbon Bond Formation in Regio- and Stereoselective Palladium-Catalyzed Cyclization of Allene-Substituted Conjugated Dienes
作者:Joakim Löfstedt、Johan Franzén、Jan-E. Bäckvall
DOI:10.1021/jo0157324
日期:2001.11.1
Regio- and stereoselective palladium-catalyzed reactions of allene-substituted 1,3-dienes 1 in acetic acid at room temperature lead to cyclization with formation of a carbon-carbon bond between the middle carbon of the allene and the terminal carbon of the 1,3-diene. Two different types of reactions, both that constitute 1,4-carboacetoxylations of the 1,3-diene, have been developed. In one of the reactions