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Short Note

2-Ethyl 4-methyl 5-amino-3-methylthiophene-2,4-dicarboxylate

by
Abdullah Mohamed Asiri
Chemistry Department, Faculty of Science, King Abdul-Aziz University, Jeddah 21589, P.O. Box 80203, Saudi Arabia
Molbank 2003, 2003(3), M340; https://doi.org/10.3390/M340
Submission received: 5 March 2003 / Accepted: 4 June 2003 / Published: 21 June 2003
Versions Notes

Molbank 2003 m340 i001
To a mixture contaning ethyl acetoacetate (13.02 g, 0.1 mol), methyl cyanoacetate (3.21 g, 0.1 mol) and sulfur (3.21 g, 0.1 mol) in ethanol ( 20 ml), morpholine (10 ml) was added dropwise over a period of 30 minutes at 35°C. The reaction mixture was heated at 65°C and stirred for 3 hrs, then allowed to cool to room temperature. The precipated powder was filtered and washed with ethanol (2x30 ml).
Recrystallization from ethanol gave off-white powder (12.65 g, 52 %).
M.p. 95-97°C (Ethanol, uncorrected).
IR ( KBr) (cm−1; KBr Disk) 3422, 3306 ( NH), 1681 (C=O), 1589 ( NH), 1331 (C-N).
1H-NMR (400 MHz; CDCl3; Me4Si, dH): 1.33 (3H, t, J = 7.16 Hz, CH3CH2O), 2.7 ( 3H, s, CH3), 3.84 (3H, s, CH3O), 4.26 ( 2H, q, J = 7.16 Hz, CH3CH2O), 6.57 ( 2H, bs, NH2).
13C-NMR (dC): 14.35, 16.0, 51.02, 60.38, 108.47, 147.89, 148.0, 162.83, 166.18, 166.46.
Elemental Analysis: Calculated for C10H13NO4S (243.28): C 49.37 %, H 5.39 %, N 5.76 %, S 13.18 %; found : C 49.22 %, H 5.42 %, N 5.84 %, S 13.01 %.

Supplementary materials

Supplementary File 1Supplementary File 2Supplementary File 3

References

  1. Gewald, K.; Schinke, E.; Böttcher, H. Chem. Ber. 1966, 99, 94–100.
  2. Gewald, K.; Neumann, G. Chem. Ber. 1968, 101, 1933–1939.
  • Sample availability: available from the author.

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MDPI and ACS Style

Asiri, A.M. 2-Ethyl 4-methyl 5-amino-3-methylthiophene-2,4-dicarboxylate. Molbank 2003, 2003, M340. https://doi.org/10.3390/M340

AMA Style

Asiri AM. 2-Ethyl 4-methyl 5-amino-3-methylthiophene-2,4-dicarboxylate. Molbank. 2003; 2003(3):M340. https://doi.org/10.3390/M340

Chicago/Turabian Style

Asiri, Abdullah Mohamed. 2003. "2-Ethyl 4-methyl 5-amino-3-methylthiophene-2,4-dicarboxylate" Molbank 2003, no. 3: M340. https://doi.org/10.3390/M340

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