Nickel- and Palladium-Catalyzed Cross-Coupling Reactions at the Bridgehead of Bicyclo[1.1.1]pentane Derivatives - A Convenient Access to Liquid Crystalline Compounds Containing Bicyclo[1.1.1]pentane Moieties
作者:Matthias Messner、Sergei I. Kozhushkov、Armin de Meijere
DOI:10.1002/1099-0690(200004)2000:7<1137::aid-ejoc1137>3.0.co;2-2
日期:2000.4
Pd(PPh3)4, or PdCl2(dppf) catalysis to give a number of 1,3-disubstituted bicyclo[1.1.1]pentyl derivatives 17, 20, and 23, several of which exhibit liquid crystalline properties, in moderate to very good yields. The coupling products 20ca, 23ab, 23ae, 23ff, and 23fg have been further transformed to yield bicyclo[1.1.1]pentyl derivatives 32, 24ab, 24ae, 27ff, and 27fg, respectively, bearing alkynyl, cyano
有机碘化物 7a-s 在 [1.1.1] 推进烷 (2) 上的自由基加成反应,然后是卤素-锂交换和与氯化锌的金属转移,以及将格利雅试剂添加到 2,提供了各种 3-取代双环[1.1.1]pentyl-1-magnesium (14) 和-zinc (19) 衍生物。后者在 NiCl2dppe、Pd(PPh3)4 或 PdCl2(dppf) 催化下与各种烯基、芳基和联芳基卤化物和三氟甲磺酸酯偶联,得到许多 1,3-二取代的双环 [1.1.1] 戊基衍生物 17 、20和23,其中一些表现出液晶性质,产率中等至非常好。偶联产物 20ca、23ab、23ae、23ff 和 23fg 已进一步转化为双环 [1.1.1] 戊基衍生物 32、24ab、24ae、27ff 和 27fg,分别带有炔基、氰基和/或烯基.