Highly Regio- and Chemoselective Palladium-Catalyzed Propargylallylation of Activated Olefins: A Novel Route to 1,7-Enyne Derivatives
作者:Masilamani Jeganmohan、Muthian Shanmugasundaram、Chien-Hong Cheng
DOI:10.1021/jo0496998
日期:2004.6.1
assembling of activated olefins, allylic chlorides, and allenylstannanes is described. Substituted arylethylidene malononitriles 1a−g (RCHC(CN)2: R = C6H5 (1a), p-ClC6H4 (1b), p-OMeC6H4 (1c), p-NO2C6H4 (1d), 1-naphthyl (1e), 2-furyl (1f), and 2-thienyl (1g)) undergo propargylallylation with allylic chlorides 2a−e (allyl chloride (2a), methallyl chloride (2b), 4-chloropent-2-ene (2c), cinnamyl chloride (2d)
描述了一种通过膦-钯催化的活化烯烃,烯丙基氯化物和烯丙基锡烷的三组分组装法合成1,7-烯炔衍生物的有效方法。取代的芳基亚乙基丙二腈1a - g(RCH C(CN)2:R = C 6 H 5(1a),p -ClC 6 H 4(1b),p -OMeC 6 H 4(1c),p -NO 2 C 6 H 4(1d),1-萘基(1e),2-呋喃基(1f)和2-噻吩基(1 g))与烯丙基氯化物2a - e(烯丙基氯化物(2a),甲烯丙基氯化物(2b),4-氯戊-2-烯(2c)进行炔丙基化,肉桂基氯(2D),和3- chlorocyclohexene(2E))和ñ -tributylallenylstannane(ñ -Bu 3 SNCH ç CH 2,图3a)中的Pd(PPh的存在3)4在甲苯中,得到相应的1,7- -烯炔衍生物4a− m好至极好的产量。催化反应具有高度的区域选择性,其中炔丙基基团加到碳