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
Synthesis of 2-arylamino-5-formyl-pyrimidines from the bis(hexafluorophosphate) Arnold salt
作者:Qiuyu Lu、Wei He、Wen Sun、Ye Feng、Li Zhan、Yu Luo
DOI:10.1177/1747519820911271
日期:2020.9
A three-step synthesis of 2-arylamino-5-formyl-pyrimidines is developed by condensation of the bis(hexafluorophosphate) Arnold salt with N-arylguanidines. This method conveniently provides the corresponding 2-arylaminopyrimidine derivatives in good yields.
Copper(II) chloride promoted transformation of amines into guanidines and asymmetrical N,N′-disubstituted guanidines
作者:Brendan Kelly、Isabel Rozas
DOI:10.1016/j.tetlet.2013.05.070
日期:2013.7
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.