A Convenient Synthesis of 2-Alkyl-mono-O-alkylated and 2-Alkyl Resorcinols

The title C, O -dialkylated resorcinols have seldom been prepared. We have developed a practical synthesis of this class of compounds starting with cyclohexane-1,3-dione. The key features of the synthesis are mono-O-alkylation of a 2-alkyl cyclohexane-1,3-dione and Pd-C catalyzed or NBS/DBU annuitization of the resultant O-alkyl-2-alkyl cyclohexane-1,3-dione. The use of cyclohexane-1,3-dione allows regioselective alkylations that would not be possible with resorcinol itself. A convenient synthesis of 2-alkyl resorcinols from cyclohexane-1,3-dione has also been achieved.     

CO2／H2和（CO／CO2）＋H2低压合成甲醇催化过程的本质

通过在Ｃｕ／ＺｎＯ／Ａｌ２Ｏ３催化剂上ＣＯ２＋Ｈ２，ＣＯ＋Ｈ２和（ＣＯ／ＣＯ２）＋Ｈ２催化反应动力学研究对合成甲醇动力学和反应机理进行了细致分析，提出合成甲醇的反应机理，解释了在（ＣＯ／ＣＯ２）＋Ｈ２合成甲醇过程中少量ＣＯ２的作用及合成甲醇的直接碳源。     

Application of catalytic dynamic resolution of N-Boc-2-lithiopiperidine to the asymmetric synthesis of 2-aryl and 2-vinyl piperidines

The highly enantioselective synthesis of 2-aryl- and 2-vinyl-piperidines has been accomplished through a catalytic dynamic resolution (CDR) of N-Boc-2-lithiopiperidine. The method has been applied to the synthesis of both enantiomers of the tobacco alkaloid anabasine.     

Oxidative ring-opening of isatins for the synthesis of 2-aminobenzamides and 2-aminobenzoates

An efficient and practical isatin-based oxidative domino protocol has been developed for the facile synthesis of 2-aminobenzamides and 2-aminobenzoates. The robust nature of this reaction system is reflected by accessible starting materials, room temperature and high-yield gram-scale synthesis.     

Synthesis of Nitroanilines Catalyzed by Horseradish Peroxidase in the Presence of NaNO2 and H2O2

The synthesis of nitroanilines catalyzed by horseradish peroxidase（HRP） in the presence of sodium nitrite and hydrogen peroxide was investigated, o-Nitroaniline and p-nitroaniline were found in the nitrated products. 2-Aminotoluene and 4-aminotoluene could also be nitrated to give corresponding nitrated products. This protocol has great potentials to open new avenues useful for the synthesis of nitroaniline and its derivatives.     

Synthesis and coordination chemistry of a water-soluble verdazyl radical. structures and magnetic properties of M(H2O)2(vdCO2)(2).2H2O (M = Co,Ni; vdCO2 = 1,5-dimethyl-6-oxo-verdazyl-3-carboxylate)

The synthesis of a verdazyl radical with a carboxylate substituent renders the radical highly soluble in water, thereby permitting the aqueous synthesis of Ni(II) and Co(II) verdazyl complexes which have been structurally and magnetically characterized.     

二苯基羟乙酮的合成

本文研究了维生素B1（VB1）催化下二苯羟乙酮的合成，找出了最佳反应条件，提高了产物的收率且重现性好。     

Synthesis of benzyl halide derivatives of spirohydantoins via [2+2+2] cyclotrimerization reaction

Generally, synthesis of hydantoin derivatives involve use of carbonyl compounds which in turn require multistep synthesis. Here, we report a new approach to assemble spirohydantoins via [2+2+2] cyclotrimerization reaction using commercially available, inexpensive hydantoin as a starting material.     

Synthesis of 2H-thiochromene derivatives (microreview)

Chemistry of Heterocyclic Compounds - The microreview considers recent methodologies for the synthesis of 2H-thiochromenes including enantioselective synthesis, multistep synthesis,...     

Substituted 2-methyl- and 2-methyleneindolines. 3. Nitroamino-5,6-disubstituted 2-methyl- and 2-methyleneindolines

A method is developed for the synthesis of 5,6-disubstituted nitroamino- and nitromethylamino-2-methyl- and-2-methyleneindolines. These are starting compounds for the synthesis of 2-methyleneindolines condensed with some heterocycle.See [1] for Communication 2.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1495–1499, November, 1990.     

手性2-甲基哌嗪的制备

手性2_甲基哌嗪在有机合成中有着广阔的应用前景。本文从手性试剂拆分、利用手性原料制备及构建手性中心等方面,对手性2_甲基哌嗪的制备过程进行了介绍并评价了各种路线的可行性和适用性。     

2'-C-branched ribonucleosides. 2. Synthesis of 2'-C-beta-trifluoromethyl pyrimidine ribonucleosides

[structure: see text]. The first synthesis of 2'-C-beta-trifluoromethyl pyrimidine ribonucleosides is described. 1,2,3,5-Tetra-O-benzoyl-2-C-beta-trifluoromethyl-alpha-D-ribofuranose (3) is prepared from 1,3,5-tri-O-benzoyl-alpha-D-ribofuranose (1) in three steps and converted to 3,5-di-O-benzoyl-2-C-beta-trifluoromethyl-alpha-D-1-ribofuranosyl bromide (5). The 1-bromo derivative (5) is found to be a powerful reaction intermediate for the synthesis of ribonucleosides. The reaction of silylated pyrimidines with (5) in the presence of HgO/HgBr2 affords exclusively the beta-anomers (6-8). Deprotection of (6-8) with ammonia in methanol yields the 2'-C-beta-trifluoromethyl nucleosides (9-11).     

Synthesis and characterization of some bifunctional 2b:2:1 cryptands

Methods for the synthesis of aromatic substituted diaza-polyoxamacrobicyclic compounds (benzocryptands) are described. New synthetic routes to cryptand precursors are developed and improvements in eryptand synthesis discussed and employed to prepare some bifunctional cryptands.     

过渡金属催化[2 + 2 + 2]环加成反应合成吡啶衍生物

环加成反应可以一步同时构建多个化学键,是目前国内外研究最为活跃的领域之一。相比于传统方法,过渡金属催化的[2+2+2]环加成反应是合成吡啶衍生物的有效手段。本文从反应机理、非手性吡啶化合物合成和手性吡啶化合物合成三个方面阐述了近年来吡啶衍生物的研究情况,涉及Co、Rh、Ru、Fe、Ni、Ti等金属催化体系。     

Synthesis and thermal investigation of Na2Cd(SO4)2·2H2O

The synthesis and thermal decomposition of Na₂(SO₄)₂·2H₂O in both air and nitrogen are described. The synthesis was performed by two different procedures, but in both cases the same product was obtained, corresponding to the general formula given above. The crystals obtained were investigated by methods of X-ray powder diffraction, and chemical and thermal analysis. The differences in thermal decomposition in air and nitrogen are discussed.     

Total synthesis of (+)-allocyathin B2

The first enantioselective synthesis of (+)-allocyathin was achieved. The synthesis features a Pd-catalyzed asymmetric allylic alkylation to install the first quaternary center, a Ru-catalyzed diastereoselective cycloisomerization to construct the six-membered ring, and a diastereoselective hydroxylative Knoevenagel reaction to introduce the final hydroxyl group. The unusual olefin isomerization of the Ru-catalyzed cycloisomerization was discussed and exploited for the synthesis.     

复合催化剂上CO_2加氢合成C_2~ 烃类

介绍了由 CO2 H2 合成 C2 烃的几种复合催化剂体系的研究进展 ,比较和评价了复合催化剂体系的活性和选择性及其对 C2 烃类生成的影响。着重于复合催化剂体系对 C4 烃的生成及产物分布的影响并简述反应机理     

Stereoselective synthesis of 2-deoxy-beta-galactosides via 2-deoxy-2-bromo- and 2-deoxy-2-iodo-galactopyranosyl donors

[reaction: see text] A series of 2-bromo- and 2-iodo-galactopyranosyl acetates and trichloroacetimidates were evaluated as glycosyl donors for the synthesis of 2-deoxygalactopyranosides. The best selectivity for the beta-glycosidic linkage was achieved by using 6-deoxy-3,4-carbonate-protected galactosyl donors.     

Synthesis of 2-Acetylindene

In connection with natural products synthesis, we had need of 2-acetylindene (IV). The only reported synthesis of this compound is by Rupe and Müller in 1921.¹ These workers formylated benzylacetone (I) and cyclized the major compound (assumed to be II) with acid to give a solid, mp 122°, reported to be IV.     

Improved synthesis of porous C2N for CO2 conversion

Since the initial introduction of porous C₂N-h2D materials by the Baek group in 2015, these materials have exhibited highly promising applications in fields such as semiconductor devices, heterogeneous catalysis, gas storage and separation, biomedicine, and more. However, much of the existing research on C₂N materials has been based on theoretical calculations due to the challenges associated with their synthesis. In this study, an enhanced synthesis method for porous C₂N materials has been successfully developed, involving the innovative and nonexplosive synthesis of hexaaminobenzene trihydrochloride (HAB·3HCl) as a crucial intermediate, as well as a time-efficient synthesis of C₂N. Rigorous structural characterizations have been conducted, including solid-state NMR analysis, among others. The resultant C₂N material has been effectively employed to improve the efficiency of CO₂ conversion reactions. This straightforward protocol for synthesizing C₂N materials is poised to stimulate further exploration and application of this promising 2D material in the near future.