A series of anti-2,3-dihydro-1,2,3-trisubstituted-1H-naphth [1,2-e][1,3]oxazine derivatives 6 were exclusively obtained in high yields for the first time through multicomponent reactions (MCRs) of 2-naphthol, aromatic aldehydes and electron rich primary amines in ethanol at room temperature using CCl3COOH as catalyst. The same reaction could be conducted effectively in solvent-free medium at 100 °C. The stereochemistry of the two hydrogens connected to C-2 and C-4 (1,3) positions of the oxazine ring are identified as anti-orientation by single crystal XRD, COSY and NOESY analysis.
Development of Environmentally Benign Methods Towards the Synthesis of anti-2,3-dihydro-1,2,3-trisubstituted-1H-naphth[1,2-e][1,3]oxazines Using Brønsted Acidic Catalysts
trifluoroacetate [DSIM][CF3COO] ionic liquid) for the preparation of complex library of anti-diastereomer of 2,3-dihydro-1,2,3-trisubstituted-1H-naphth [1,2-e][1,3]oxazines 4 from the three components reaction of 2-naphthol, p-substituted aromatic aldehydes and primary amines in 25 % aqueous ethanol at room temperature or in neat conditions at 80 °C. The reactions utilized 15 mol% of the two conventional acids to
Triphenylsulfophosphonium chlorometallates as efficient heterogeneous catalysts for the three-component synthesis of 2,3-dihydro-1,2,3-trisubstituted-1H-naphth[1,2-e][1,3]oxazines
作者:Arup Kumar Dutta、Pinky Gogoi、Ruli Borah
DOI:10.1016/j.poly.2016.11.038
日期:2017.2
FT-IR, Raman, TGA, powder XRD, UV–Vis, SEM-EDX, ICP and CHN elemental analyses. All these solids were evaluated as heterogeneous catalysts for the multicomponent synthesis of anti-2,3-dihydro-1,2,3-trisubstituted-1H-naphth[1,2-e][1,3]oxazines from a mixture of 2-naphthol, aryl aldehyde and a nucleophilic primary amine by stirring in 50% aqueous ethanol at room temperature and under neat conditions at
摘要开发了四种新型的SO3H官能化的三苯基硫代氯代金属盐离子盐[TPSP] n [X],其中n = 1或2且X = FeCl4−,Zn2Cl62−,NiCl42−,MnCl42−是稳定的固体酸性材料,并通过NMR表征, FT-IR,拉曼光谱,TGA,粉末XRD,UV-Vis,SEM-EDX,ICP和CHN元素分析。所有这些固体均作为非均相催化剂,用于由2的混合物以多组分合成抗2,3-二氢-1,2,3-三取代的1H-萘[1,2-e] [1,3]恶嗪-萘酚,芳基醛和亲核伯胺,方法是在室温和80°C的纯净条件下,在50%的乙醇水溶液中搅拌。