Synthesis and Structure of Ethyl 3-acetamido-4-aryl-6-methyl-2-oxo-3,4-dihydropyran-5-carboxylates |
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Authors: | PAN Cheng-Xue LIANG Xiao-Long SU Gui-Fa HUANG Wan-Yunb LI Li |
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Institution: | [1]State Key Laboratory Cultivation Base for the Chemistry and Molecular Engineering of Medicinal Resources, College of Chemistry & Chemical Engineering, Guangxi Normal University, Cruilin 541004, China [2]Department of Chemistry, Guilin Normal College, Guilin 541001, China |
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Abstract: | Two ethyl 3-acetamido-4-aryl-6-methyl-2-oxo-3,4-dihydropyran-5-carboxylates(3) were synthesized with high diastereoselectivities and characterized by IR,NMR and MS.The configuration of 3a was confirmed by single-crystal X-ray diffraction,ethyl 3-acetamido-4-(4-nitrophenyl)-6-methyl-2-oxo-3,4-dihydropyran-5-carboxylate(3a),C17H18N2O7.The crystal is of orthorhombic,space group Pbca with a = 11.7781(16),b = 9.5979(10),c = 32.115(3),V = 3630.4(7)3,Z = 8,Mr = 362.33,Dc = 1.326 Mg/m^3,λ = 0.71073,μ(MoKα) = 0.104 mm^-1,F(000) = 1520,the final R = 0.0646 and wR = 0.1464 for 1788 observed reflections with I 〉 2σ(I).The N-H and oxygen atom are involved in intermolecular hydrogen bonds which link the molecules into a one-dimensional chain and stabilize the structure. |
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Keywords: | pyran-2-ones synthesis crystal structure |
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