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Procedure for the Preparation of Dimethyl 7-[Cyclohexyl(2-ethoxy-2- oxoacetyl)amino]-5H-[1,3]thiazolo[3,2-a] pyrimidine-5,6-dicarboxylate (4a, To a magnetically stirred solution of ethyl 2-oxo-2-(1,3-thiazol-2-yl-amino)acetate (0.200 g, 1 mmol) and dimethyl acetylene-dicarboxylate (0.142 g, 1 mmol) in anhyd CH2Cl2 (6 mL) was added dropwise a solution of cyclohexyl isocyanide (0.109 g, 1 mmol) in anhyd CH2Cl2 (2 mL) at 25°C over 10 min. The reaction mixture was then stirred for 24 h. The solvent was removed and the residue was purified by column chromatography using n-hexane-EtOAc (1:2) as eluent. The solvent was removed and the product was obtained. Yield: 0.41 g (90, yellow crystals. IR (KBr, 1744, 1725, 1680, 1657 (C=O, 1535, 1483, 1414, 1340, 1223, 1193, 1121 cm-1. 1H NMR500.1 MHz, CDCl3, δ, 1.06-2.02 [t, J, 7.0 Hz, 3 H, OCH 2
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2 (2 mL) at 25°C over 10 min. The reaction mixture was then stirred for 24 h. The solvent was removed and the residue was purified by column chromatography using n-hexane-EtOAc (1:2) as eluent. The solvent was removed and the product was obtained. Yield: 0.41 g (90%); yellow crystals. IR (KBr):(...)
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Selected X-ray Crystallographic Data for Compound 4a: C20H25N3O7S, monoclinic, space group, P21/n, a, 8.7880(9) Å b, 20.488(2) Å, c, 12.2861(12) Å, β, 99.901 (1)°, V, 2179.1 (4) Å3, T, 295(2) K, Z, 4, Dcalcd, 1.376 g cm-3, μ(Mo-Kα, 0.195 mm -1, 16164 reflections measured, 4061 unique reflections Rint, 0.032, 3284 observed reflections, final R 1, 0.050, ωR2, 0.128 and for all data R1, 0.062. CCDC 640870 contains the supplementary crystallographic data for this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via
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1 = 0.062. CCDC 640870 contains the supplementary crystallographic data for this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/ data_request/cif.
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