Palladium-Catalyzed Chemoselective Monoarylation of Hydrazides for the Synthesis of [1,2,4]Triazolo[4,3-<i>a</i>]pyridines
作者:Andreas Reichelt、James R. Falsey、Robert M. Rzasa、Oliver R. Thiel、Michal M. Achmatowicz、Robert D. Larsen、Dawei Zhang
DOI:10.1021/ol902868q
日期:2010.2.19
efficient and convenientmethod for the synthesis of [1,2,4]triazolo[4,3-a]pyridines was exemplified by the synthesis of 20 analogues bearing a variety of substituents at the 3-position. The methodology involves a palladium-catalyzed addition of hydrazides to 2-chloropyridine, which occurs chemoselectively at the terminal nitrogen atom of the hydrazide, followed by dehydration in acetic acid under microwave
合成[1,2,4]三唑并[4,3- a ]吡啶的一种有效而方便的方法,是通过合成20个在3位带有取代基的类似物来举例说明的。该方法包括将钯催化的酰肼加成至2-氯吡啶,其在酰肼的末端氮原子上发生化学选择性,然后在微波辐射下于乙酸中脱水。
Assembly of <i>N</i>,<i>N</i>-Disubstituted Hydrazines and 1-Aryl-1<i>H</i>-indazoles via Copper-Catalyzed Coupling Reactions
作者:Xiaodong Xiong、Yongwen Jiang、Dawei Ma
DOI:10.1021/ol300847v
日期:2012.5.18
CuI-catalyzed coupling of N-acyl-N′-substituted hydrazines with aryl iodides takes place at 60–90 °C to afford N-acyl-N′,N′-disubstituted hydrazines regioselectively and thereby gives a facile method for assembling N,N-diaryl hydrazines. N-Acyl-N′-substituted hydrazines can also react with 2-bromoarylcarbonylic compounds at 60–125 °C under the catalysis of CuI/4-hydroxy-l-proline to provide 1-aryl-1H-indazoles
Imidazo- and triazolo-pyridine compounds and methods of use thereof
申请人:Zhang Dawei
公开号:US20080161303A1
公开(公告)日:2008-07-03
The present invention comprises a new class of compounds useful for the prophylaxis and treatment of protein kinase mediated diseases, including inflammation and related conditions. The compounds have a general Formula I
wherein A, B, R
1
, R
2
, R
3
and R
4
are defined herein. The invention also comprises pharmaceutical compositions including one or more compounds of Formula I, uses of such compounds and compositions for treatment of P38 map kinase mediated diseases including rheumatoid arthritis, psoriasis and other inflammation disorders, as well as intermediates and processes useful for the preparation of compounds of Formula I.
Polymorphism in a π stacked Blatter radical: structures and magnetic properties of 3-(phenyl)-1-(pyrid-2-yl)-1,4-dihydrobenzo[<i>e</i>][1,2,4]triazin-4-yl
作者:Christos P. Constantinides、Daniel B. Lawson、Georgia A. Zissimou、Andrey A. Berezin、Aaron Mailman、Maria Manoli、Andreas Kourtellaris、Gregory M. Leitus、Rodolphe Clérac、Heikki M. Tuononen、Panayiotis A. Koutentis
DOI:10.1039/d0ce00789g
日期:——
susceptibility studies indicate that both polymorphsexhibit antiferromagnetic interactions inside their 1D π stacks. The magnetic susceptibility data are best interpreted in terms of a regular chain model of antiferromagnetically coupled quantum spins with exchange-interactions of J/kB = −36.7(3) K (−25.5(2) cm−1) for 2α and J/kB = −72(3) K (−50(2) cm−1) for 2β. For polymorph 2β, a crossover on the magnetic
3-(苯基)-1-(吡啶-2-基)-1,4-二氢苯并[ e ] [1,2,4]三嗪-4-基(2)证明了布拉特家族的第一个多态性实例部首。已经通过单晶X射线衍射法和磁化率测量法鉴定并表征了两个多晶型物2α和2β,以研究它们的磁结构相关性。两种多晶型物都形成一维(1D)π堆栈,这些π堆栈由均匀隔开的基团组成,它们的π-π重叠模式明显不同。在1Dπ堆栈中,自由基位于均匀的晶面间距内,其中2α为3.461Å,2β为3.430Å。磁化率研究表明,两种多晶型物在其一维π堆栈内部均显示反铁磁相互作用。磁化率数据最好根据反铁磁耦合量子自旋的正则链模型来解释,其中2α和J /的交换相互作用为J / k B = −36.7(3)K(−25.5(2)cm -1)对于2β,k B = −72(3)K(−50(2)cm -1)。对于多晶型物2β,磁化率在20 K附近的交叉表明存在相变,这可能与自由基沿链的二聚化有关
The Synthesis of Polyazaindenes and Related Compounds