Pyrylium-mediated transformations of natural products. Part 5. Reactions of gelatin and chymotrypsin with 4-(4-methoxy-3-sulphophenyl)-2,6-bis-(4-sulphophenyl)pyrylium perchlorate
作者:Alan R. Katritzky、Jerzy L. Mokrosz、Maria L. Lopez-Rodriguez
DOI:10.1039/p29840000875
日期:——
The title pyrylium salt reacts with lysine residues in gelatin and chymotrypsin in aqueous buffer to form rapidly the corresponding divinylogous amide and pseudobase in a ratio depending on the protein concentration. First-order ring closure of the divinylogous amide proceeds at rates comparable to those observed with the analogous intermediate from free lysine.