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Current Organic Synthesis

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ISSN (Print): 1570-1794
ISSN (Online): 1875-6271

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Research Article

Synthesis of Phthaloylglycyl Hydrazide Derivatives: Selective Protection of Phthalimide Group from Hydrazinolysis

Author(s): Ankur Gera*, Chander Mohan and Sandeep Arora

Volume 15, Issue 6, 2018

Page: [839 - 845] Pages: 7

DOI: 10.2174/1570179415666180601083256

Price: $65

Abstract

Background: N-phthalimide amino acid hydrazide is a class of compounds that have the potential therapeutic use. In general, hydrazinolysis of N-substituted amino acid(s) ester removes the ester group and yields the corresponding hydrazide. However, in case if N-substitution group is phthalimide, phthalimide group is cleaved and not the ester group. The resulted compound, therefore, is amino acid ester rather than Nphthalimide amino acid hydrazide. The above class of compounds, because of susceptibility of phthalimide group to hydrazinolysis, has previously been synthesized by a lengthy three-step procedure.

Objective: N-phthaloylglycyl hydrazide was synthesized by using new efficient, simplified, one step process. Hydrazone derivatives from substituted benzaldehydes, and substituted furaldehyde were also synthesized.

Method: N-phthaloylglycyl hydrazide was synthesized from the corresponding carboxylic acid using 1-Ethyl- 3-(3-dimethylaminopropyl)carbodiimide (EDC) as a coupling agent and hydroxybenzotriazole (HOBt) as an activator. Hydrazone derivatives were synthesized by condensation of N-phthaloylglycyl hydrazide with substituted benzaldehyde/substituted furaldehydes. All the compounds were characterized by IR, 1H-NMR, 13CNMR, mass spectroscopy and elemental analysis.

Results: The presence of EDC/HOBt resulted in hydrazinolysis of the carboxylic acid group and not the phthalimide group. N-phthaloylglycyl hydrazide was synthesized in good yield.

Conclusion: We report the improved process of the synthesis of N-phthaloylglycyl hydrazide. This is the first report where stability of phthaloyl amino acid compound to hydrazine is demonstrated. The reaction may be explored for the reaction schemes where stability of phthalimide group to hydrazinolysis is required.

Keywords: Phthaloyl glycine, phthaloylglycyl hydrazide, hydrazinolysis, EDC, HOBt, phthaloyl aminoacid hydrazide.

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