The Heck reaction of β-arylacrylamides with aryl iodides afforded the corresponding vinylic substitution products usually in high yields. The nature of β-substituents, aryl iodides and substituents at the nitrogen atom influences the stereochemical outcome. N,N-Dimethyl-β-arylacrylamides gave vinylic substitution products with higher stereoselectivity than the corresponding N-unsubstituted β-arylacrylamides. β-Arylacrylamides containing ortho-substituents led to the formation of only one stereoisomer. The procedure was used to prepare 4-aryl-2-quinolones from β-(o-bromophenyl)acrylamide through a sequential Heck reaction and copper-catalyzed cyclization process.
β-芳基
丙烯酰胺与芳基
碘的Heck反应通常以高产率得到相应的烯基取代产物。β-取代基、芳基
碘以及氮原子上的取代基对立体
化学结果有影响。N,N-二甲基-β-芳基
丙烯酰胺相较于相应的N-未取代β-芳基
丙烯酰胺,其烯基取代产物具有更高的立体选择性。含邻位取代基的β-芳基
丙烯酰胺生成单一立体异构体。通过连续的Heck反应和
铜催化的环化过程,该方法被用于从β-(邻
溴苯基)
丙烯酰胺制备4-芳基-2-
喹诺酮。