Efficient synthetic protocol for substituted guanidines via copper(I)-mediated intermolecular amination of isothiourea derivatives
作者:Hitoshi Ube、Daisuke Uraguchi、Masahiro Terada
DOI:10.1016/j.jorganchem.2006.06.046
日期:2007.1
Amination of S-methyl-N,N′-bis-Boc-isothiourea with either primary or sterically hindered secondary amines promoted by copper(I) chloride and K2CO3 gave N,N′-bis-Boc protected guanidines in good to excellent yields under mild reaction conditions.
用氯化铜(I)和K 2 CO 3促进的伯或空间位阻仲胺对S-甲基-N,N'-双-Boc-异硫脲进行胺化,得到N,N'-双-Boc保护的胍在温和的反应条件下具有优异的收率。
Improved method for the preparation of guanidines
作者:Kyoung Soon Kim、Ligang Qian
DOI:10.1016/s0040-4039(00)61537-x
日期:1993.11
Use of N,N′-di-(tert-butoxycarbonyl)thiourea 1 in the presence of mercuric chloride provides a very efficient method for the bis-Boc protected guanidine formation of the amino compounds which are highly deactivated either sterically or electronically.
A Mild and Inexpensive Procedure for the Synthesis of N,N′-Di-Boc-Protected Guanidines
作者:Andrea Porcheddu、Lidia De Luca、Giampaolo Giacomelli
DOI:10.1055/s-0029-1218365
日期:2009.12
A novel and efficient synthetic procedure for converting a diverse set of amines to N,N′ -di-Boc-protected guanidines is described. The methodology comprises the use of cyanuricchloride (TCT) as activating reagent for di-Boc-thiourea. The employ of inexpensive TCT instead of classical HgCl 2 eliminates the environmental hazard of heavy-metal waste without appreciable loss of yield or reactivity. This
An efficient NIS-promoted guanylation reaction is described. This procedure allows the guanylation of primary and secondary amines through the reaction with di-Boc-thiourea and di-Boc-S-methylisothiourea, respectively. We demonstrated that the use of NIS compares favorably with existing methods and is an attractive alternative to heavy metal or Mukayama's reagent activation. (C) 2009 Elsevier Ltd. All rights reserved.
A Convenient and Versatile Method for the Synthesis of Protected Guanidines
作者:Zhao-Xia Guo、Andrew N. Cammidge、David C. Horwell
DOI:10.1080/00397910008087443
日期:2000.8
Aromatic, aliphatic and sterically hindered amines react smoothly with commercially available N,N'-bis-BOC-S-methylisothiourea 2 in the presence of mercury chloride to give the protected guanidine in good yield. It is particularly noteworthy that 2 can also be employed in a straightforward, two-step synthesis of monoaryl internal guanidines.