[EN] FUNGICIDAL N'-[2-METHYL-6-[2-ALKOXY-ETHOXY]-3-PYRIDYL]-N-ALKYL-FORMAMIDINE DERIVATIVES FOR USE IN AGRICULTURE [FR] DÉRIVÉS FONGICIDE DE N'- [2-MÉTHYL -6- [2-ALCOXY-ÉTHOXY]-3-PYRIDYL]-N-ALKYL-FORMAMIDINE DESTINÉS À ÊTRE UTILISÉS DANS L'AGRICULTURE
Zinc Powder Catalysed Formylation and Urealation of Amines Using
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作者:Chongyang Du、Yaofeng Chen
DOI:10.1002/cjoc.202000072
日期:2020.10
valuable organiccompounds catalysed by cheap and biocompatible metal catalysts is one of important topics of current organic synthesis and catalysis. Herein, we report the zinc powder catalysed formylation and urealation of amines with CO2 and (EtO)3SiH under solvent free condition. Using 2 mol% zinc powder as the catalyst, a series of secondary amines, both the aromatic ones and the aliphatic ones,
Amine modified mesoporous Al<sub>2</sub>O<sub>3</sub>@MCM-41: an efficient, synergetic and recyclable catalyst for the formylation of amines using carbon dioxide and DMAB under mild reaction conditions
作者:Deepak B. Nale、Dharitri Rath、K. M. Parida、Aravind Gajengi、Bhalchandra M. Bhanage
DOI:10.1039/c5cy02277k
日期:——
This work reports an amine modified meso Al2O3@MCM-41, particularly the ordered mesoporous silica, as a catalyst for the formylation of amines with carbondioxide (CO2) and with dimethylamine-borane (DMAB) as a green reducing source. This newly developed catalytic system represents a heterogeneous and environmentally benign protocol. Besides this, the catalyst could be reused for five consecutive cycles
这项工作报告了胺改性的介孔Al 2 O 3 @ MCM-41,特别是有序介孔二氧化硅,可作为胺与二氧化碳(CO 2)和二甲胺-硼烷(DMAB)作为绿色还原源进行甲酰化的催化剂。这种新开发的催化系统代表了一种异构且对环境无害的方案。除此之外,该催化剂可以连续五个循环使用,而对甲酰胺合成的催化活性没有任何重大损失。胺改性的内消旋Al 2 O 3MCM-41催化剂具有高角度和低角度XRD,程序升温脱附(TPD),BET表面积,TGA / DTA和FT-IR分析技术的特点。研究了各种反应参数(如温度,CO 2压力,时间以及底物与DMAB的比例)对合成甲酰胺的影响。所开发的方案可适用于生物活性化合物中最重要的关键中间体的合成,例如福莫特罗,奥利司他,白细胞变蛋白和艾拉莫德。
An Efficient Protocol for Formylation of Amines Using Carbon Dioxide and PMHS under Transition-Metal-Free Conditions
作者:Bhalchandra Bhanage、Deepak Nale
DOI:10.1055/s-0035-1561571
日期:——
green and simple base catalytic system was investigated for the formylation of amines using CO 2 and PMHS [poly(methylhydrosiloxane)] under mild reaction conditions. This reaction proceeds smoothly without additives and furnishes the corresponding N-formylated products from both the 1° and the 2° aliphatic as well as aromaticamines in good to excellent yields.
Cationic carbon to nitrogen rearrangements in the reactions of N-(sulfonyloxy)amines with aldehydes
作者:Robert V. Hoffman、James M. Salvador
DOI:10.1021/jo00042a032
日期:1992.7
A series of aromatic and aliphatic aldehydes was reacted with N-((p-nitrobenzenesulfonyl)oxy)methylamine in chloroform. Products resulting from both carbon migration and hydride migration to nitrogen were isolated. The ratios of carbon to hydride migration products were used to clarify the reaction mechanism. The results support a two-step process in which cationic carbon to nitrogen rearrangement is rate determining.
Gas-Phase <sup>1</sup>H NMR Studies of Internal Rotation Activation Energies and Conformer Stabilities of Asymmetric <i>N,N</i>-Disubstituted Formamides and Trifluoroacetamides
作者:A. N. Taha、S. M. Neugebauer Crawford、N. S. True
DOI:10.1021/jp9734080
日期:1998.2.1
Activation parameters and conformational stabilities characterizing the internal rotation about the peptide bond in a series of N,N-asymmetric dialkylformamides (HCONR1R2: R-1 = CH3, R-2 = propyl, butyl, and isopropyl) and N,N-asymmetric dialkyltrifluoroacetamides (F3CCONR1R2: R-1 = CH3, R-2 = propyl, butyl, and isopropyl) are determined from temperature-dependent gas-phase H-1 NMR spectra. Conformer free energy differences, Delta G(298)(0)(syn-anti), in cal mol(-1), and activation free energies, Delta G(298)(double dagger), in kcal mol(-1), for the formamides are -83(14)/19.4(0.1) for R-2 = Propyl, -80(14)/19.3(0.1) for R-2 = butyl, and -91(13)/19.1(0.1) for R-2 = isopropyl and for the trifluoroacetamides 178(24)/16.8(0.1) for R-2 = propyl, 191(53)/16.6(0.1) for R-2 = butyl, and 218(29)/16.3(0.1) for R-2 = isopropyl. The preferred conformer in both the gas and Liquid phases has the N-methyl group syn to the carbonyl oxygen in the formamide systems and the N-methyl group anti to the carbonyl oxygen in the trifluoroacetamides. The gas-phase results are compared to liquid-phase values.