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Synthesis of Chiral TFA-Protected α-Amino Aryl-Ketone Derivatives With Friedel-Crafts Acylation of α-Amino Acid N-Hydroxysuccinimide Ester

Synthesis of Chiral TFA-Protected α-Amino Aryl-Ketone Derivatives With Friedel-Crafts Acylation of α-Amino Acid N-Hydroxysuccinimide Ester

Zetryana Puteri Tachrim, Kazuhiro Oida, Haruka Ikemoto, Fumina Ohashi, Natsumi Kurokawa, Kento Hayashi, Mami Shikanai, Yasuko Sakihama, Yasuyuki Hashidoko, Makoto Hashimoto

Molecules. 2017 Oct 17;22(10):1748.

PMID: 29039791

Abstract:

Chiral N-protected α-amino aryl-ketones are one of the useful precursors used in the synthesis of various biologically active compounds and can be constructed via Friedel-Crafts acylation of N-protected α-amino acids. One of the drawbacks of this reaction is the utilization of toxic, corrosive and moisture-sensitive acylating reagents. In peptide construction via amide bond formation, N-hydroxysuccinimide ester (OSu), which has high storage stability, can react rapidly with amino components and produces fewer side reactions, including racemization. This study reports the first synthesis and utilization of N-trifluoroacetyl (TFA)-protected α-amino acid-OSu as a potential acyl donor for Friedel-Crafts acylation into various arenes. The TFA-protected isoleucine derivative and its diastereomer TFA-protected allo-isoleucine derivative were investigated to check the retention of α-proton chirality in the Friedel-Crafts reaction. Further utilization of OSu in other branched-chain and unbranched-chain amino acids results in an adequate yield of TFA-protected α-amino aryl-ketone without loss of optical purity.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP55750613	Maleimidoacetic acid N-hydroxysuccinimide ester		55750-61-3	Price
AP89889521	Biotinamidohexanoyl-6-aminohexanoic acid N-hydroxysuccinimide ester		89889-52-1	Price

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