Highly Atom Efficient Guanylation of both Aromatic and Secondary Amines Catalyzed by Simple Lanthanide Amides
作者:Qinghai Li、Shaowu Wang、Shuangliu Zhou、Gaosheng Yang、Xiancui Zhu、Yuyu Liu
DOI:10.1021/jo0709089
日期:2007.8.31
It is demonstrated that the cyclopentadienyl-free simple lanthanide amides [(Me3Si)2N]3Ln(μ-Cl)Li(THF)3 (Ln = La, Sm, Eu, Y, Yb) and Ln[N(SiMe3)2]3 (Ln = Y, Yb) are highlyefficientcatalysts for the guanylation of both aromatic and secondary amines with a high activity under mild conditions. It is found that these catalysts are compatible with a wide range of solvents and substrates.
Catalytic guanylation of aliphatic, aromatic, heterocyclic primary and secondary amines using nanocrystalline zinc(II) oxide
作者:M. Lakshmi Kantam、S. Priyadarshini、P.J. Amal Joseph、P. Srinivas、A. Vinu、K.J. Klabunde、Yuta Nishina
DOI:10.1016/j.tet.2012.05.044
日期:2012.7
to be a highly efficient heterogeneous catalyst for the guanylation of amines with various carbodiimides to afford N,N′,N″-trisubstituted guanidines in excellent yields. Structurally divergent aliphatic, aromatic, heterocyclic primary and secondaryamines were converted to the corresponding N,N′,N″-trisubstituted guanidines using optimal conditions. The catalyst was easy to handle even under atmospheric