作者: Zhu Du , Wenbo Li , Xuehua Zhu , Fan Xu , Qi Shen
DOI: 10.1021/JO801693Z
关键词:
摘要: Various divalent lanthanide complexes with the formula LnL2(sol)x (L = N(TMS)2, sol THF, x 3, Ln Sm (I), Eu (II), Yb (III); L MeC5H4, 2, (IV); ArO(Ar [2,6-(tBu)2-4-MeC6H2]), (V)), especially I−III, serve as excellent catalyst precursors for catalytic addition of various primary and secondary amines to carbodiimides, efficiently providing corresponding guanidine derivatives a wide range substrates under solvent-free condition. The reaction shows good functional groups tolerence. Complexes I−III are also precatalysts terminal alkynes carbodiimides yielding series propiolamidines. active sequence < metal MeC5H4 ArO N(TMS)2 ligand around was observed both reactions. first step in reactions supposed include formation bimetallic bisamidinate samarium species originating from reduction-coupling carbodiimide ...