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
在室温下,丙二烯取代的1,3-二烯1在乙酸中的区域和立体选择性钯催化反应导致环化,并在丙二烯的中间碳和1,的末端碳之间形成碳-碳键3-二烯。已经开发出两种不同类型的反应,它们都构成1,3-二烯的1,4-碳乙酰氧基化。在一种反应中,Pd(II)催化1氧化为双环化合物2,在另一种反应中,Pd(0)催化1转化为双环化合物3。产物2可用于进一步的合成转化并进行Diels-Alder与亲二烯体的反应,得到多环系统。