Epimerization-free access to C-terminal cysteine peptide acids, carboxamides, secondary amides, and esters via complimentary strategies.

Epimerization-free access to C-terminal cysteine peptide acids, carboxamides, secondary amides, and esters via complimentary strategies.
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DOI:
10.1039/c7sc03553e
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发表时间:
2018-01-14
期刊:
影响因子:
8.4
通讯作者:
Stockdill JL
Stockdill JL
中科院分区:
化学1区
文献类型:
--
作者:
Arbour CA;Kondasinghe TD;Saraha HY;Vorlicek TL;Stockdill JL

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We present a convenient method for the diversification of peptides bearing cysteine at the C-terminus that proceeds to form a variety of carboxylic acid, carboxamide, 2° amide, and ester terminated peptides without any detectable epimerization of the α-stereocenter. C-Terminal cysteine peptide acids are difficult to access without epimerization of the cysteine α-stereocenter. Diversification of the C-terminus after solid-phase peptide synthesis poses an even greater challenge because of the proclivity of the cysteine α-stereocenter to undergo deprotonation upon activation of the C-terminal carboxylic acid. We present herein two general strategies to access C-terminal cysteine peptide derivatives without detectable epimerization, diketopiperazine formation, or piperidinylalanine side products.
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发表时间: 2002-11-01
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