The Sandmeyer Reaction on Some Selected Heterocyclic Ring Systems: Synthesis of Useful 2-Chloroheterocyclic-3-carbonitrile Intermediates
作者:Abdelouahid Samadi、José Marco-Contelles、Daniel da Silva、Mourad Chioua、Maria do Carmo Carreiras
DOI:10.1055/s-0030-1258149
日期:2010.8
The Sandmeyer reaction on some selected heterocycles bearing the 2-amino-3-carbonitrile structural moiety has been investigated in order to prepare the corresponding 2-chloro-3-carbonitrile derivatives as synthetic useful intermediates for further development. Sandmeyer reaction - 2-amino(heterocyclic)-3-carbonitriles - 2-aminopyrazoles - 2-aminooxazoles - 2-amino-4H-pyrans - 2-amino-1,4-dihydropyridines
Keggin heteropolyacid in auto-tandem catalysis: confinement effects over ordered mesoporous silica in the synthesis of 2-pyridones
作者:Adriana Galván、Edgar Damian-Ascencio、Merced Martínez、José Manuel Domínguez-Esquivel、Miguel A. Vázquez
DOI:10.1039/d3nj00384a
日期:——
auto-tandem catalysis involving the ring-opening/ring-closure/oxidation sequence of 4H-pyrans. The morphology of the support structure affects the duality of HPW. Whereas the MCF complex favors oxidation, the SBA-15 complex favors Brønsted acidity (finding greater oxidation when adding water). The hybrid catalyst was recovered and reused for eight consecutive reaction cycles with no significant loss
有必要设计和开发更简单、更有效和更清洁的合成方法来制备越来越复杂的分子。一种有趣的策略是多催化。本研究的目的是通过将 H 3 PW 12 O 40 (HPW)(一种多金属氧酸盐)固定在离子液体功能化介孔二氧化硅(SBA-15 或 MCF)上来合成多催化混合体系。所得催化剂通过不同技术表征,包括 N 2吸附-解吸、酸性位点的 Boehm 滴定、SEM-EDS、FT-IR、XPS、CP-MAS 和 NMR。为了测试 HPW 的活性位点酸-氧化剂二元性,在一锅法中合成了 2-吡啶酮,其中自动串联催化涉及 4 H-吡喃的开环/闭环/氧化序列。支撑结构的形态影响 HPW 的二元性。MCF 复合物有利于氧化,而 SBA-15 复合物有利于 Brønsted 酸度(加水时发现更强的氧化)。混合催化剂被回收并重复用于八个连续的反应循环,没有明显的活性损失。
Srivastava, Seema; Batra, Sanjay; Bhaduri, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1996, vol. 35, # 6, p. 602 - 604
作者:Srivastava, Seema、Batra, Sanjay、Bhaduri
DOI:——
日期:——
Modification of conditions for the selective preparation of 2-amino-3-cyano-4-phenylpyridines
作者:Mónica Álvarez-Pérez、José Marco-Contelles
DOI:10.3998/ark.5550190.0012.223
日期:——
We herein describe the modification of the experimental conditions for the synthesis of certain 2amino-4-aryl-3-cyanopyridines from benzaldehyde, malononitrile, ammonium acetate and aminoketones. The outcome of the reaction proved to be highly dependent on the experimental procedure, occasionally giving rise to metaphthalodinitriles. Mechanistical proposals are also reported, in order to explain the