Guanylation/cyclisation of amino acid esters using an imidazolin-2-iminato titanium initiator
作者:Suman Das、Jayeeta Bhattacharjee、Tarun K. Panda
DOI:10.1039/c8dt04630a
日期:——
corresponding quinazolinone and urea derivatives under mild conditions using two titanium(IV) complexes [(ImRN)2Ti(NMe2)2] (R = tBu, 2a; R = Mes, 2b), which were synthesised by reacting tetrakis(dimethylamido)titanium(IV) [Ti(NMe2)4] with imidazolin-2-imine [ImRNH; R = tert-butyl (tBu) (1a), mesityl (Mes) (1b)] in a 1 : 2 molar ratio in toluene. Furthermore, the reaction of titanium complex 2a with 2,6-diisopropylphenylamine
我们报道了在较温和的条件下使用两种钛(IV)配合物[(Im R N)2 Ti(NMe 2)2 ](R = t Bu,通过使四(二甲基酰胺基)钛(IV)[Ti(NMe 2)4 ]与咪唑啉-2-亚胺[Im R NH;2a; R = Mes,2b)进行合成。R =叔丁基(t Bu)(1a),异丁基(Mes)(1b)]在甲苯中的摩尔比为1:2。此外,钛络合物的反应2A 2,6- diisopropylphenylamine(DippNH 2)得到相应的混合配体钛络合物[κ 1 - (IM吨卜N)2的Ti(NME 2)(HNDipp)](3A)。与此相反,复合体的反应图2a与2,6-二甲基苯酚,得到单-咪唑啉-2- iminato钛IV酚络合物[κ 1 - (IM吨卜N)的Ti(O-1,6-ME 2 Ç 6 H 3)3 ](4a)。通过单晶X射线衍射分析建立的络合物2b,3a和4a的固态结构,在每种