Iodine-Catalyzed Regioselective Sulfenylation of 4H-Pyrido[1,2-a]pyrimidin-4-ones with Sulfonyl Hydrazides
作者:Shaohua Wang、Wenjie Liu、Zhihao Cai、Ziying Li、Jianwen Liu、Anda Wang
DOI:10.1055/s-0036-1588549
日期:2018.1
A simple and efficient method for direct sulfenylation of 4H-pyrido[1,2-a]pyrimidin-4-ones with sulfonyl hydrazides has been developed. The transformation is catalyzed by iodine under metal-free conditions with high regioselectivity and good functional-group tolerance.
Regioselective C3 Alkenylation of 4 <i>H</i>-pyrido[1,2-<i>a</i>]pyrimidin-4-ones via Palladium-Catalyzed CH Activation
作者:Wenjie Liu、Shaohua Wang、Qi Zhang、Jingwen Yu、Jiahe Li、Zhiwei Xie、Hua Cao
DOI:10.1002/asia.201402455
日期:2014.9
A general and efficient palladium‐catalyzed direct C3alkenylation of 4H‐pyrido[1,2‐a]pyrimidin‐4‐ones using AgOAc/O2 as the oxidant has been developed. A variety of 4H‐pyrido[1,2‐a]pyrimidin‐4‐ones were successfully coupled with acrylate esters, styrenes, methylvinylketone, and acrylamide in moderate to excellent yields. The reaction exhibited complete regio‐ and stereoselectivity. This transformation
已经开发了一种以AgOAc / O 2为氧化剂的4 H-吡啶并[1,2 - a ]嘧啶-4-酮的普通钯催化的直接C3烯基化反应。各种4 H-吡啶并[1,2 - a ]嘧啶-4-酮已成功与丙烯酸酯,苯乙烯,甲基乙烯基酮和丙烯酰胺偶联,产率中等至优异。该反应显示出完全的区域选择性和立体选择性。该转化提供了一种有吸引力的新方法,可对4个H-吡啶并[1,2- a ]嘧啶-4-酮进行功能化。
Synthesis of Halogenated 4H-Pyrido[1,2-a]pyrimidin-4-ones
作者:István Hermecz、Annamária Molnár、Ferenc Faigl、Benjamin Podányi、Zoltán Finta、László Balázs
DOI:10.3987/com-09-11746
日期:——
4-diones. The latters formed from N-(2-pyridyl)iminoketenes, the common intermediates of 4H-pyrido[1,2-a]pyrimidin-4-one and 1,8-naphthyridin-4-ones, via a "head-to-tail" [4+2] cycloaddition. 3-Halo-4H-pyrido[1,2-a]pyrimidin-4-ones were obtained from 4H-pyrido[1,2-a]pyrimidin-4-one with N-halosuccinimides. The structures of the new compounds were characterized by means of 1 H NMR and 13 C NMR examinations
Aryl nitrile compounds and compositions and their uses in treating inflammatory and related disorders
申请人:Bergeron Philippe
公开号:US20070015773A1
公开(公告)日:2007-01-18
Compounds, compositions and methods that are useful in the treatment of inflammatory and immune conditions and diseases are provided herein. In particular, the invention provides aryl nitrile compounds which modulate the expression and/or function of a chemokine receptor. The subject methods are useful for the treatment of inflammatory and immunoregulatory disorders and diseases, such as multiple sclerosis, rheumatoid arthritis, type I diabetes, asthma, psoriasis and inflammatory bowel disease.