Molecules 2013, 18(12), 14747-14759; doi:10.3390/molecules181214747
Article

OxymaPure/DIC: An Efficient Reagent for the Synthesis of a Novel Series of 4-[2-(2-Acetylaminophenyl)-2-oxo-acetylamino] Benzoyl Amino Acid Ester Derivatives

1,2,* email, 1email, 3,4email and 5,6,7,8,* email
Received: 24 September 2013; in revised form: 15 November 2013 / Accepted: 20 November 2013 / Published: 28 November 2013
(This article belongs to the Section Theoretical Chemistry)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: OxymaPure (ethyl 2-cyano-2-(hydroxyimino)acetate) was tested as an additive for use in the carbodiimide (DIC) approach for the synthesis of a novel series of α-ketoamide derivatives (4-[2-(2-acetylaminophenyl)-2-oxo-acetylamino]benzoyl amino acid ester derivatives). OxymaPure showed clear superiority to HOBt/DIC or carbodiimide alone in terms of purity and yield. The title compounds were synthesized via the ring opening of N-acylisatin. First, N-acetylisatin was reacted with 4-aminobenzoic acid under conventional heating as well as microwave irradiation to afford 4-(2-(2-acetamidophenyl)-2-oxoacetamido)benzoic acid. This α-ketoamide was coupled to different amino acid esters using OxymaPure/DIC as a coupling reagent to afford 4-[2-(2-acetylaminophenyl)-2-oxo-acetylamino]benzoyl amino acid ester derivatives in excellent yield and purity. The synthesized compounds were characterized using FT-IR, NMR, and elemental analysis.
Keywords: N-acetylisatin; 4-aminobenzoic acid; amino acid esters; DIC; OxymaPure; α-ketoamide
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MDPI and ACS Style

El-Faham, A.; Al Marhoon, Z.; Abdel-Megeed, A.; Albericio, F. OxymaPure/DIC: An Efficient Reagent for the Synthesis of a Novel Series of 4-[2-(2-Acetylaminophenyl)-2-oxo-acetylamino] Benzoyl Amino Acid Ester Derivatives. Molecules 2013, 18, 14747-14759.

AMA Style

El-Faham A, Al Marhoon Z, Abdel-Megeed A, Albericio F. OxymaPure/DIC: An Efficient Reagent for the Synthesis of a Novel Series of 4-[2-(2-Acetylaminophenyl)-2-oxo-acetylamino] Benzoyl Amino Acid Ester Derivatives. Molecules. 2013; 18(12):14747-14759.

Chicago/Turabian Style

El-Faham, Ayman; Al Marhoon, Zainab; Abdel-Megeed, Ahmed; Albericio, Fernando. 2013. "OxymaPure/DIC: An Efficient Reagent for the Synthesis of a Novel Series of 4-[2-(2-Acetylaminophenyl)-2-oxo-acetylamino] Benzoyl Amino Acid Ester Derivatives." Molecules 18, no. 12: 14747-14759.

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