Direct (11)CN-Labeling of Unprotected Peptides via Palladium-Mediated Sequential Cross-Coupling Reactions.

Direct (11)CN-Labeling of Unprotected Peptides via Palladium-Mediated Sequential Cross-Coupling Reactions.
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通过钯介导的顺序交叉偶联反应对未受保护的肽的直接(11)CN标记。

DOI:
10.1021/jacs.7b02761
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发表时间:
2017-05-31
影响因子:
15
通讯作者:
Hooker JM
Hooker JM
中科院分区:
化学1区
文献类型:
--
作者:
Zhao W;Lee HG;Buchwald SL;Hooker JM

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A practical procedure for 11CN-labeling of native peptides has been developed. The process involves two sequential Pd-mediated cross-coupling reactions at the cysteine residue of a peptide and operates under mild conditions. The method was shown to be highly chemoselective for cysteine over other potentially nucleophilic residues and the radiolabelled products were synthesized and purified in less than 15 minutes. Appropriate for biomedical applications, the method could be used on extremely small scale (20 nmol) with high radiochemical yield. The success of the protocol stems from the use of a Pd-reagent based on a dihaloarene, which enables direct “nucleophile-nucleophile” coupling of the peptide and [11C]-cyanide by temporal separation of nucleophile addition.
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