Pd(II)/Ag(I)-Promoted One-Pot Synthesis of Cyclic Ureas from (Hetero)Aromatic Amines and Isocyanates
作者:So Won Youn、Yi Hyun Kim
DOI:10.1021/acs.orglett.6b03151
日期:2016.12.2
A simple and facile one-pot reaction has been developed to afford a diverse range of N,N′-disubstituted benzimidazolones and imidazopyridinones containing two differently substituted N atoms. A cooperative Pd(II)/Ag(I) system promotes the sequential addition/intramolecular C–H amidationreaction of (hetero)aromatic amines and isocyanates, leading to the formation of two C–N bonds. A mechanism involving
已经开发出一种简单且容易的一锅反应,以提供包含两个不同取代的N原子的N,N'-二取代的苯并咪唑酮和咪唑并吡啶并酮的不同范围。协同的Pd(II)/ Ag(I)系统促进了(杂)芳族胺和异氰酸酯的顺序加成/分子内CH-H酰胺化反应,导致形成两个C-N键。一种机制,涉及在Ag 2 CO 3氧化剂和Pd(OAc)2存在下通过单电子转移(SET)生成的自由基中间体提出了路易斯酸。该协议使用易于获得的起始原料,良好的官能团耐受性和高效率,提供了一种操作简便,简单且可靠的方法。
Two-Step Synthesis of 3-Aryl-1,3-Dihydro-2<i>H</i>-imidazo[4,5-<i>b</i>]pyridin-2-ones
作者:Jeremy Scott
DOI:10.1055/s-2006-947355
日期:2006.8
One-pot tandem palladium-catalysed amination and intramolecular amidation of tert-butyl (2-chloropyridin-3-yl)carbamate with substituted primary anilines allows for the preparation of 3-arylated 1,3-dihydro-2H-imidazo[4,5-b]pyridin-2-ones (49-90% yield) in two steps from commercially available materials.
The present invention is directed to compounds of the formula:
that are antagonists of CGRP receptors and that are useful in the treatment or prevention of diseases in which the CGRP is involved, such as headache, migraine and cluster headache. The invention is also directed to pharmaceutical compositions comprising these compounds and the use of these compounds and compositions in the prevention or treatment of such diseases in which CGRP is involved.
The present invention is directed to compounds of the formula:
that are antagonists of CGRP receptors and that are useful in the treatment or prevention of diseases in which the CGRP is involved, such as headache, migraine and cluster headache. The invention is also directed to pharmaceutical compositions comprising these compounds and the use of these compounds and compositions in the prevention or treatment of such diseases in which CGRP is involved.
Synthesis of 1-and 3-substituted imidazo[4,5-b]pyridin-2-ones
作者:Yu. M. Yutilov、N. N. Smolyar、D. A. Lomov
DOI:10.1134/s1070428006060145
日期:2006.6
1- and 3-Substituted imidazo[4,5-b]pyridin-2-ones were synthesized by heating equimolar amounts of 3-amino-2-chloropyridine or 2-chloro-3-methylaminopyridine, urea, and the corresponding arylamine at 150-210 degrees C. The reaction of 3-amino-2-chloropyridine with urea and p-phenylenediamine or p,p'-diaminobiphenyl at a ratio of 2:2:1 under analogous conditions gave 1,4-bis-(2-oxoimidazo[4,5-b]pyridin-3-yl)benzene or 1,4-bis(2-oxoimidazo[4,5-b]pyridin-3-yl)biphenyl, respectively.