A method of enantiomerically enriching chiral cyanohydrins is disclosed that involves selective cleavage of the unwanted enantiomer into its cleavage products HCN and the corresponding aldehyde or ketone by use of an enantioselective dehydrocyanation catalyst, coupled with simultaneous removal of at least one of the dehydrocyanation products.
Synthesis, characterization, and anorectic testing of the four stereoisomers of cyclo(histidylproline)
作者:Michael J. Kukla、Henry J. Breslin、Charles R. Bowden
DOI:10.1021/jm00149a035
日期:1985.11
All four possible stereoisomers of cyclo(histidylproline) were individually synthesized, purified, and characterized. They were each tested for anorectic activity in rats with a free feeding paradigm over 24 h. Contrary to literature reports, none significantly reduced food intake at any time over the test period.
US5241087A
申请人:——
公开号:US5241087A
公开(公告)日:1993-08-31
Synthesis of Histidine-Containing Oligopeptides via Histidine-Promoted Peptide Ligation
作者:Kai-Jin Huang、Yi-Chen Huang、Yuya A. Lin
DOI:10.1002/asia.201701802
日期:2018.2.16
synthesis of histidine‐containing peptides is not trivial due to the potential of imidazole sidechain of histidine to act as a nucleophile if unprotected. A peptide ligation method utilizing the imidazole sidechain of histidine has been developed. The key imidazolate intermediate that acts as an internal acyltransfercatalyst during ligation is generated by deprotonation. Transesterification with amino