Microwave Assisted and Efficient Synthesis of Substituted Thiazole Acid Derivatives

Title:Microwave Assisted and Efficient Synthesis of Substituted Thiazole Acid Derivatives

Volume: 14 Issue: 7

Author(s): Dattatraya N. Pansare*, Rohini N. Shelke and Chandrakant D. Pawar

Affiliation:

• Department of Chemical Technology, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad 431 004, MS,India

Keywords: Amino acids, conventional method, Knoevenagel condensation, 2-thioxothiazolidin-4-one, microwave irradiation, yield.

Abstract: Background: An effective approach to the synthesis of some new (Z)-2-((5-(4- chlorobenzylidene)-4-oxo-4,5-dihydrothiazol-2-yl)amino) substituted acids 7a-l is reported under microwave irradiation as well as conventional conditions. The method provides rapid and easy access to thiazolidinone compounds in good to excellent yields.

Methods: In a 100 mL round bottom flask, the compound (Z)-5-(4-chlorobenzylidene)-2-thioxothiazolidin- 4-one 3 (0.5 gm, 1 mmol), triethylamine (0.2 gm, 1.2 mmol) and dichloromethane (1 mL) was added at room temperature. To the stirred reaction mixture with iodomethane (0.3 gm, 1.2 mmol) was added and stirred for 1 h at room temperature.

Results: This study synthesized (Z)-5-(4-chlorobenzylidene)-2-(methylthio)thiazol-4(5H)-one 5 (Scheme 2) and screening of model reaction (Z)-2-((5-(4-chlorobenzylidene)-4-oxo-4,5-dihydrothiazol-2-yl)amino) propanoic acid 7a (Scheme 3, Table 1). This study developed the protocol for the synthesis of compound 7a by condensation of compounds 5 and 6a. After the initial success with ethanol, various solvents and bases were screened and the results are shown in Table 1. The reactions of compound 5 (1 mmol) and compound 6a (1.2 mmol), catalyzed by various bases and various solvents were selected as a model reaction to optimize the reaction conditions.

Conclusion: In conclusion, we successfully developed an easy access to a new series of (Z)-2-((5-(4- chlorobenzylidene)-4-oxo-4,5-dihydrothiazol-2-yl)amino)substituted acid derivatives. This method provides an easy and rapid access to pharmaceutical important thiazolidinone derivatives. We reported here shorter reaction time, cleaner reaction profile and excellent yield of the products, by MW irradiation as well as conventional method synthesis.

Cite this article as:

Pansare N. Dattatraya*, Shelke N. Rohini and Pawar D. Chandrakant, Microwave Assisted and Efficient Synthesis of Substituted Thiazole Acid Derivatives, Letters in Organic Chemistry 2017; 14 (7) . https://dx.doi.org/10.2174/1570178614666170524142722

DOI https://dx.doi.org/10.2174/1570178614666170524142722	Print ISSN 1570-1786
Publisher Name Bentham Science Publisher	Online ISSN 1875-6255