Electrophilic Cyclization Involving Carbon–Selenium/Carbon–Halide Bond Formation: Synthesis of 3-Substituted Selenophenes
作者:Kamila Kaiser Casola、Matheus Rick Gomes、Davi Fernando Back、Gilson Zeni
DOI:10.1021/acs.joc.8b01136
日期:2018.6.15
influence. Furthermore, by monitoring the reaction by 1H NMR, we were able to identify the key intermediate, which supported the elaboration of a proposed reaction mechanism. The 3-iodoselenophenes prepared allowed the synthesis of multifunctional selenophenes via application in metal-catalyzed coupling reactions, such as Sonogashira, Ullmann and Suzuki type reactions.
丁基硒基炔丙基炔醇与碘反应生成3-碘硒烯。亲核试剂位置从炔丙基变为高炔丙基对于芳构化和亚硒环的形成至关重要。实验表明,溴和氮-溴琥珀酰亚胺不能使丁基硒基炔丙基炔醇环化;但是,当溴源是溴化铜(II)时,可以良好的产率获得相应的3-溴硒代苯。此外,丁基亚硒基炔丙醇与碘化铜(I)催化的二有机基二硒烯的反应得到了3-(有机基壬基)硒代苯。该反应是用在炔烃和炔丙基位置上被给电子或吸电子基团取代的芳环进行的。取代基的空间效应是决定产率的主要因素,而电子效应的影响很小。此外,通过1监控反应1 H NMR,我们能够确定关键的中间体,这支持了拟议的反应机理的阐述。通过应用在金属催化的偶联反应中,例如Sonogashira,Ullmann和Suzuki型反应中,制备的3-碘代硒烯可以合成多功能硒烯。