Highly Efficient Synthesis of Stereodefined Multisubstituted 1,4-Dicyano- and 1-Cyano-1,3-butadienes and Their Reactions with Organolithium Reagents
作者:Congyang Wang、Chao Wang、Qifeng Wang、Zhihui Wang、Hui Sun、Xiangyu Guo、Zhenfeng Xi
DOI:10.1002/chem.200700028
日期:2007.7.27
1-cyano-4-halo-1,3-butadienes and organolithium reagents. When 1,4-dicyano-1,3-butadienes were treated with organolithium reagents followed by trapping with electrophiles, a tandem process took place to afford 2H-pyrrolyl nitriles in excellent yields. Reduction of 1,4-dicyano-1,3-butadiene derivatives with LiAlH4 showed novel reaction patterns relative to normal nitriles.
立体定义的多取代的1-氰基和1,4-二氰基-1,3-丁二烯衍生物从相应的单卤代和二卤代丁二烯和CuCN中以优异的产率获得了分离的产物。该反应以高的立体选择性进行并且保留了起始卤代丁二烯的立体化学。通过它们与有机锂试剂的反应证明了对如此获得的1-氰基和1,4-二氰基-1,3-丁二烯衍生物的效用的研究。由1-氰基-4-卤代-1,3-丁二烯和有机锂试剂以高收率形成2H-吡咯或亚氨基环戊二烯衍生物。当用有机锂试剂处理1,4-二氰基-1,3-丁二烯,然后用亲电试剂捕集时,进行了串联反应,从而以优异的收率得到了2H-吡咯基腈。减少1,4-dicyano-1,