Pyrylium-mediated transformations of natural products. Part 6. Preparation of pyridinium salts derived from aminoglycosides
作者:Alan R. Katritzky、Yu-Kun Yang、Joan Ellison、Jorge Marquet
DOI:10.1039/p29840000879
日期:——
Kanamycins A and B react with a variety of water-soluble pyrylium ions in aqueous solution specifically at the 6′-primary-alkyl primary amine functions to give the corresponding pyridinium ions in high yield. Neomycin also reacts at only one amino group. Products were characterised by 13C n.m.r. and elemental analysis.
卡那霉素A和B与水溶液中的多种水溶性吡啶鎓离子发生反应,特别是在6'-伯烷基伯胺官能团处,以高收率得到相应的吡啶鎓离子。新霉素也仅在一个氨基上反应。产品通过13 C nmr和元素分析进行表征。
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.