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A New Regioselective Synthesis of the Cysteine-Rich Peptide Linaclotide
Zhonghao Qiu1,2, Xiandong Dai1, Chongxu Fan1
1State Key Laboratory of NBC Protection for Civilian, Beijing 102205, China.
Abstract:
Linaclotide is a 14-amino acid residue peptide approved by the FDA for the treatment of irritable bowel syndrome with constipation (IBS-C), which activates guanylate cyclase C to accelerate intestinal transit. Here we show a new method for the synthesis of linaclotide through the completely selective formation of three disulfide bonds in satisfactory overall yields via mild oxidation reactions of the solid phase and liquid phase, using 4-methoxytrityl (Mmt), diphenylmethyl (Dpm) and 2-nitrobenzyl (O-NBn) protecting groups of cysteine as substrate, respectively.
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