Effective approach to ureas through organocatalyzed one-pot process
摘要:
An efficient approach to N, N'-unsymmetrically substituted ureas 9 has been developed through the ammonolysis process of N-Boc protected anilines 7 with amines prompted by 1,5,7-triazabicyclo[4.4.0] dec-5-ene (TBD). Moreover, a convenient protocol for the synthesis of the symmetric N, N'-substituted ureas 12 by one-pot diammonolysis process of Boc(2)O with amines catalyzed by DABCO has also been achieved. With broad substrate scope and mild conditions, these two methods demonstrate practical preparation of both unsymmetrical and symmetrical ureas. (C) 2017 Published by Elsevier Ltd.
Boehmer, Recueil des Travaux Chimiques des Pays-Bas, 1936, vol. 55, p. 379,383
作者:Boehmer
DOI:——
日期:——
Effective approach to ureas through organocatalyzed one-pot process
作者:Mingliang Wang、Jilai Han、Xiaojia Si、Yimin Hu、Jidong Zhu、Xun Sun
DOI:10.1016/j.tetlet.2017.11.030
日期:2018.4
An efficient approach to N, N'-unsymmetrically substituted ureas 9 has been developed through the ammonolysis process of N-Boc protected anilines 7 with amines prompted by 1,5,7-triazabicyclo[4.4.0] dec-5-ene (TBD). Moreover, a convenient protocol for the synthesis of the symmetric N, N'-substituted ureas 12 by one-pot diammonolysis process of Boc(2)O with amines catalyzed by DABCO has also been achieved. With broad substrate scope and mild conditions, these two methods demonstrate practical preparation of both unsymmetrical and symmetrical ureas. (C) 2017 Published by Elsevier Ltd.
Folding and anion-binding properties of an indolocarbazole dimer with urea appendages
作者:Hyun Joo Kim、Jae-Min Suk、Kyu-Sung Jeong
DOI:10.1080/10610278.2012.713955
日期:2013.1
prepared as an anion receptor which contained eight NHhydrogenbonds donors. Two indolocarbazole units were coupled through a butadiynyl linker to allow for helical folding of the resulting dimer by intramolecular hydrogen bonding and dipole–dipole attractions as proven in the 1H NMR spectroscopy. The dimer was found to bind anions (Cl− , Br− , N3 − , AcO− , and ) by multiple hydrogenbonds in 10% (v/v)