Studies on Condensed Pyrimidine Systems. XIX. A New Synthesis of Pyrido [2,3-d] pyrimidines. The Condensation of 1,3-Diketones and 3-Ketoaldehydes with 4-Aminopyrimidines
Diazoaldehyde Chemistry. Part 3. Synthesis of 4-acyl-1<i>H</i>-1,2,3-triazole derivatives
作者:Özkan Sezer、Kadir Dabak、Ahmet Akar、Olcay Anaç
DOI:10.1002/hlca.19960790212
日期:1996.3.20
Ten new α-diazo-β-oxoaldehydes were condensed with aniline, ammonia, hydroxylamine, and semicarbazide to yield new 4-acyl-(1-substituted)-1H-1,2,3-triazoles in moderate-to-good yields. The method is simple and regiospecific. The latter feature makes this method superior to the widely used acylacetylene + azide approach.
将十种新的α-重氮-β-乙醛与苯胺,氨,羟胺和氨基脲缩合,以中等至良好的产率生成新的4-酰基-(1-取代)-1 H -1,2,3-三唑。该方法简单且区域特异性。后一种功能使该方法优于广泛使用的酰基乙炔+叠氮化物方法。
Diazoaldehyde Chemistry. Part 1. Transdiazotization of Acylacetaldehydes in Neutral-to-Acidic Medium. A Direct Approach to the Synthesis of α-Diazo-β-oxoaldehydes
作者:Özkan Sezer、Olcay Anaç
DOI:10.1002/hlca.19940770819
日期:1994.12.14
non-deformylating transdiazotization of acylacetaldehydes was achieved: the reactions of 2-azido-l-ethylpyridinium tetrafluoroborate (4) with acylacetaldehydes 3 proceeded partially without deformylation to yield 16 new α-diazo-β-oxoaldehydes 1 along with diazomethyl ketones 2, especially in the presence of NaOAc (Scheme 1, Tables 1 and 2). The product distribution was substituent-dependent and could
Chalcogen–Chalcogen Bonding Catalysis Enables Assembly of Discrete Molecules
作者:Wei Wang、Haofu Zhu、Shuya Liu、Zhiguo Zhao、Liang Zhang、Jingcheng Hao、Yao Wang
DOI:10.1021/jacs.9b03806
日期:2019.6.12
X-ray crystal structures, catalysis that harnesses the power of such chalcogen-chalcogen bonding interactions to produce advanced molecules remains an unresolved problem. Here, we show that a class of extraordinary chalcogen-bonding catalysts enables assembly of discrete small molecules including three β-ketoaldehydes and one indole, leading to the construction of N-heterocycles in a highly efficient manner
尽管观察到 X 射线晶体结构中硫属元素原子之间的非共价相互作用,利用这种硫属元素-硫属元素键合相互作用的力量来产生高级分子的催化作用仍然是一个悬而未决的问题。在这里,我们展示了一类非凡的硫属键合催化剂能够组装离散的小分子,包括三个 β-酮醛和一个吲哚,从而以高效的方式构建 N-杂环。这些设计合理的催化剂的强大活化能力为硫属元素键合催化的内在局限性提供了通用的解决方案。
Yasuda, Yakugaku Zasshi/Journal of the Pharmaceutical Society of Japan, 1959, vol. 79, p. 623,626
作者:Yasuda
DOI:——
日期:——
Condensations of Unsymmetrical Ketones. I. Condensations with Ethyl Formate