Oxidant-Mediated Nitrogenation and Recyclization of Imidazo[1,2-<i>a</i>
]pyridines with Sodium Azide: Synthesis of 4<i>H</i>
-Pyrido[1,2-<i>a</i>
][1,3,5]triazin-4-ones
for the synthesis of 4H‐pyrido[1,2‐a][1,3,5]triazin‐4‐ones starting from readily available imidazo[1,2‐a]pyridines and sodium azide has been presented under aerobic oxidative conditions. The reaction proceeded well with the promotion of potassium persulfate/potassium permanganate with good functional group tolerance. A wide range of biologically valuable 4H‐pyrido[1,2‐a][1,3,5]triazin‐4‐one scaffolds
从容易获得的咪唑并[1,2- a ]吡啶和叠氮化钠开始合成4 H-吡啶并[1,2- a ] [1,3,5]三嗪-4-的快速简便的方法在有氧氧化条件下出现。反应进行得很好,促进了过硫酸钾/高锰酸钾的吸收,并且具有良好的官能团耐受性。通过这种方法组装了多种具有生物学价值的4 H-吡啶并[1,2- a ] [1,3,5]三嗪-4-1支架。也实现了克级反应。反应中可能涉及级联的硝化和氧化再循环序列。
The dearomative annulation between N-2-pyridylamidine and CO<sub>2</sub> toward pyrido[1,2-a]-1,3,5-triazin-4-ones
A base-promoted dearomative annulation between N-2-pyridylamidine and an atmospheric pressure of CO2 was developed, affording a series of pyrido[1,2-a]-1,3,5-triazin-4-ones in moderate to excellent yields. CO2 served as a carbonyl source, releasing H2O as a solely clean byproduct. Moreover, no dehydrating reagent and transition-metal catalyst were required in this procedure. Thus, it represents a green
开发了碱促进的N -2-吡啶基lam啶与大气压CO 2之间的脱芳香环化反应,提供了一系列中等至极好的吡啶并[1,2 - a ] -1,3,5-triazin-4-ones产量。CO 2用作羰基源,释放H 2 O作为纯净的副产物。而且,在该程序中不需要脱水剂和过渡金属催化剂。因此,它代表了访问此类框架的绿色,可持续和直接途径。
A novel synthesis of 2-substituted pyrido[1,2-a]-1,3,5-triazin-4-ones by the reaction of N-fluoropyridinium salts with cyanate ion and carbonitriles: Evidence in support of a carbene intermediate
作者:Alexander S. Kiselyov、Lucjan Strekowski
DOI:10.1016/s0040-4039(00)76512-9
日期:1994.1
A carbene 5'' derived from N-fluoropyridinium cation is the suggested intermediate in the novel synthesis of pyridotriazines 3. rmediate/
MATERIALS FOR ORGANIC ELECTROLUMINESCENT DEVICES
申请人:Merck Patent GmbH
公开号:US20220310932A1
公开(公告)日:2022-09-29
The invention relates to compounds which are suitable for use in electronic devices, and to electronic devices, in particular organic electroluminescent devices, containing said compounds.