Copper(II) chloride promoted transformation of amines into guanidines and asymmetrical N,N′-disubstituted guanidines
摘要:
We present a concise, less-toxic and broadly applicable method for coupling weakly nucleophilic amines with N,N'-di-(tert-butoxycarbonyl)thiourea, N-(tert-butxoycarbonyl), N'-alkyl/arylsubstituted-thioureas and N,N'-di-(tert-butoxycarbonyl)imidazolidine-2-thione in the presence of copper(II) chloride. Subsequent removal of Boc protecting groups affords guanidines, di-substituted guanidines and 2-aminoimidazolines in modest to excellent overall yields. (C) 2013 Elsevier Ltd. All rights reserved.
Synthesis of guanidines via the I2 mediated desulfurization of N,N′-di-Boc-thiourea
作者:Hao-Jie Rong、Cui-Feng Yang、Tao Chen、Yong-Qiang Wang、Bin-Ke Ning
DOI:10.1016/j.tetlet.2019.150970
日期:2019.8
The I2 mediated desulfurization of N,N′-di-Boc-thiourea was developed. Various primary amines, including sterically and electronically deactivated primary amines, were transformed into the corresponding bis-Boc protected guanidines under mild conditions.
Iodine-catalyzed guanylation of amines with<i>N</i>,<i>N</i>′-di-Boc-thiourea
作者:Hao-Jie Rong、Cui-Feng Yang、Tao Chen、Ze-Gang Xu、Tian-Duo Su、Yong-Qiang Wang、Bin-Ke Ning
DOI:10.1039/c9ob02014d
日期:——
Herein, we report that iodine-catalyzed guanylation of primary amines can be accomplished with N,N'-di-Boc-thiourea and TBHP to afford the corresponding guanidines in 40-99% yields. Oxidation of the HI byproduct by TBHP eliminates the need for an extra base to prevent the protonation of substrates and makes the reaction especially useful for both electronically and sterically deactivated primary anilines