Copper-Mediated Radiocyanation of Unprotected Amino Acids and Peptides.

Copper-Mediated Radiocyanation of Unprotected Amino Acids and Peptides.
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DOI:
10.1021/jacs.2c01959
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发表时间:
2022-04-27
影响因子:
15
通讯作者:
Sanford, Melanie S.
Sanford, Melanie S.
中科院分区:
化学1区
文献类型:
--
作者:
Sharninghausen, Liam S.;Preshlock, Sean;Joy, Stephen T.;Horikawa, Mami;Shao, Xia;Winton, Wade P.;Stauff, Jenelle;Kaur, Tanpreet;Koeppe, Robert A.;Mapp, Anna K.;Scott, Peter J. H.;Sanford, Melanie S.

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This report describes a copper-mediated radiocyanation of aryl halides that is applicable to complex molecules. This transformation tolerates an exceptionally wide range of functional groups, including unprotected amino acids. As such, it enables the site-specific introduction of 11C[CN] into peptides at an iodophenylalanine residue. The use of a diamine-ligated copper(I) mediator is crucial for achieving high radiochemical yield under relatively mild conditions, thus limiting racemization and competing side reactions of other amino acid side chains. The reaction has been scaled and automated to deliver radiolabeled peptides, including analogues of adrenocorticotropic hormone 1–27 (ACTH) and nociceptin (NOP). For instance, this Cu-mediated radiocyanation was leveraged to prepare >40 mCi of [11C]cyano-NOP to evaluate biodistribution in a primate using positron emission tomography. This investigation provides preliminary evidence that nociceptin crosses the blood-brain barrier and shows uptake across all brain regions (SUV >1 at 60 min post-injection), consistent with the known distribution of NOP receptors in the rhesus brain.
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