Catalytic Addition of Amine NH Bonds to Carbodiimides by Half-Sandwich Rare-Earth Metal Complexes: Efficient Synthesis of Substituted Guanidines through Amine Protonolysis of Rare-Earth Metal Guanidinates
作者:Wen-Xiong Zhang、Masayoshi Nishiura、Zhaomin Hou
DOI:10.1002/chem.200601383
日期:2007.5.7
Reaction of [Ln(CH(2)SiMe(3))(3)(thf)(2)] (Ln=Y, Yb, and Lu) with one equivalent of Me(2)Si(C(5)Me(4)H)NHR' (R'=Ph, 2,4,6-Me(3)C(6)H(2), tBu) affords straightforwardly the corresponding half-sandwich rare-earth metal alkyl complexes [Me(2)Si(C(5)Me(4))(NR')}Ln(CH(2)SiMe(3))(thf)(n)] (1: Ln = Y, R' = Ph, n=2; 2: Ln = Y, R' = C(6)H(2)Me(3)-2,4,6, n=1; 3: Ln = Y, R' = tBu, n=1; 4: Ln = Yb, R' = Ph, n=2; 5: Ln
[Ln(CH(2)SiMe(3))(3)(thf)(2)](Ln = Y,Yb和Lu)与一当量的Me(2)Si(C(5)Me( 4)H)NHR'(R'= Ph,2,4,6-Me(3)C(6)H(2),tBu)直接提供相应的半三明治稀土金属烷基络合物[ 2)Si(C(5)Me(4))(NR')} Ln(CH(2)SiMe(3))(thf)(n)](1:Ln = Y,R'= Ph,n = 2; 2:Ln = Y,R'= C(6)H(2)Me(3)-2,4,6,n = 1; 3:Ln = Y,R'= tBu,n = 1; 4 :Ln = Yb,R′= Ph,n = 2; 5:Ln = Lu,R′= Ph,n = 2)。这些配合物,特别是钇配合物1-3,是用于将各种伯胺和仲胺催化加成到碳二亚胺上的极好的催化剂前体,有效地产生了一系列在氮原子上具有广泛取代基的胍衍生物。官能团,例如C [三化学键]