N 掺杂的多孔碳 (NC) 是由甘蔗渣合成的,甘蔗渣是一种可持续且广泛使用的生物质废物。优选的 NC 样品具有发达的多孔结构、类似石墨烯的表面形态和不同的 N 种类。更重要的是,多相碳催化剂在各种杂环氮化合物的有氧脱氢反应中表现出优异的催化性能(49个例子,产率高达96%),类似于C 3 N 4和GO。TEM、BET 和 XPS 表征以及 EPR 分析表明,NC 的增强催化性能来自其对 O 2和杂环氮的高活化能力,分别归因于多孔结构和吡啶 N (N-6) 物种.
The present invention relates to novel heterocyclic compounds and to their use in the treatment of various disease states, including cardiovascular diseases and diabetes. In particular embodiments, the structure of the compounds is given by Formula (I):
wherein Q1, Q2, R2, R3, R4, R5, and R6 are as described herein.
The invention also relates to methods for the preparation of the compounds, and to pharmaceutical compositions containing such compounds.
Ring-contraction of hantzsch esters and their derivatives to pyrroles <i>via</i> electrochemical extrusion of ethyl acetate out of aromatic rings
作者:Xu Liu、Chang Liu、Xu Cheng
DOI:10.1039/d1gc00487e
日期:——
ring-contraction of HEs and theirs pyridinederivatives is developed to obtain polysubstituted pyrroles. This process provides an orthogonal utilization of Hantzsch esters for the well-documented application as side chain or hydrogen donors. The formal transformation shows an extrusion of ethyl acetate out of the pyridine ring in a single step. In addition to the novel transformation, we also discovered the Lewis
Solid state photochemistry of 1,4-dihydropyridines
作者:Hamid R. Memarian、Arsalan Mirjafari
DOI:10.1016/j.bmcl.2005.05.026
日期:2005.7
Photochemical behavior of some 1,4-dihydropyridines has been investigated in the solidstate. Whereas upon irradiation of 1,4-dihydropyridines in solution phase, their photo-oxidation and formation of pyridine derivatives have been observed, irradiation of these compounds in the solidstate decreases their light sensitivity. In many cases photo-oxidation has been observed only in very low yields.