Diels–Alder reactions of polyfluorocyclohexa-1,3-dienes. Part II. Addition of nitriles to perfluorocyclohexa-1,3-diene. A route to 2-substituted tetrafluoropyridines
作者:L. P. Anderson、W. J. Feast、W. K. R. Musgrave
DOI:10.1039/j39690002559
日期:——
Perfluorocyclohexa-1,3-diene reacts by 1,4-addition at high temperatures and pressures with nitriles RCN (I) which have highly electronegative substituents (R = CF3, Br, C6F5 and [CF2]3CN). The 3-substituted octafluoro-2-azabicyclo[2,2,2]octa-2,5-dienes (II) so formed are generally unstable under the reaction conditions and either undergo retro-Diels–Alder addition or spontaneously eliminate tetrafluoroethylene
全氟环己-1,3-二烯在高温和高压下通过1,4-加成与具有高负电性取代基(R = CF 3,Br,C 6 F 5和[CF 2 ] 3 CN)的腈RCN(I )反应。如此形成的3-取代的八氟-2-氮杂双环[2,2,2]八-2,5-二烯(II)在反应条件下通常不稳定,并且可以通过逆Diels-Alder加成反应或自发消除四氟乙烯而得到相应的2-取代的四氟吡啶(III)。全氟戊二腈还通过两次添加和消除以低产率得到全氟-1,3-双-(2-吡啶基)丙烷。