Super-Electron Donors: Bis-pyridinylidene Formation by Base Treatment of Pyridinium Salts
作者:John A. Murphy、Jean Garnier、Stuart R. Park、Franziska Schoenebeck、Sheng-ze Zhou、Andrew T. Turner
DOI:10.1021/ol800134g
日期:2008.3.1
bispyridinium salt 7b affords bispyridinylidene 10, a very powerful neutral organic two-electron donor [E1/2 (DMF)=-1.13 V vs Ag/AgCl/KCl (sat)], presumably via the pyridinylidene 8. Donor 10 reduces aryl iodides and bromides to aryl anions in excellent yield and also reductively cleaves selected phenylalkylsulfones very efficiently.
双吡啶鎓盐7b的去质子化可提供双吡啶鎓亚叉基10,这是一种非常强大的中性有机两电子给体[E1 / 2(DMF)=-1.13 V vs Ag / AgCl / KCl(sat)],大概是通过吡啶基亚苄基8进行的。供体10还原了芳基碘化物和溴化物以优异的收率得到芳基阴离子,并且还非常有效地还原性裂解选定的苯基烷基砜。