Synthesis of Heterocycles by Intramolecular Nucleophilic Substitution at an Electron-Deficient sp2 Nitrogen Atom
作者:Jarosław Sączewski、Maria Gdaniec
DOI:10.1002/ejoc.200901520
日期:2010.4
1-c][1,2,4]thiadiazoles have been synthesized by intramolecular nucleophilic substitution reactions at the electron-deficient sp(2) nitrogen atom of 2-(hydroxyimino)imidazolidine O-sulfonate. The displacement of the sulfate leaving group by both nitrogen and sulfur anionic nucleophiles proceeds exothermically by in-plane S(N)2 sigma nucleophilic substitution.
2-Aryl(arylsulfony1)-6,7-dihydro-2H-imidazo[2,1-c][1,2,4]triazol-3(5H)-ones 和 3-arylimino-6,7-dihydroimidazo[2] ,1-c][1,2,4] 噻二唑已通过分子内亲核取代反应在 2-(羟基亚氨基) 咪唑烷 O-磺酸盐的缺电子 sp(2) 氮原子处合成。氮和硫阴离子亲核试剂对硫酸盐离去基团的置换是通过面内 S(N)2 σ 亲核取代放热进行的。