Investigations on Pantothenic Acid and Its Related Compounds. XIII. Chemical Studies. (6). Syntheses of Homopantethine and Some Other Pantethine Analogs
作者:OSAMU NAGASE、HIROAKI TAGAWA、MASAO SHIMIZU
DOI:10.1248/cpb.16.977
日期:——
Four pantethine analogs (homopantethine (VII), α-methyl-(XIIIb) and β-methyl-pantethine (XIIIc), and oxypantetheine (XVI)) were prepared. Synthesis of VII from D-pantothenonitrile (I) and homocysteamine by using the thiazine derivative (III) as an intermediate was established. XIIIb and XIIIc were synthesized by the thiazoline method described previously, and XVI by the general method.
Studies on the syntheses of 2(1H)-pyridone derivatives. II. Reactions of N-substituted 6-chloro-2(1H)-pyridones with ethylenediamine, 2-aminoethanethiol and related compounds.
It has been found that Smiles rearrangement leading to N-p-chlorophenyl-6-β-hydroxyethylamino-4-phenyl-2 (1H)-pyridone (II) took place when 6-β-aminoethoxy-N-p-chlorophenyl-4-phenyl-2 (1H)-pyridone (III) was heated in acetic acid, and that the reaction of an N-substituted 6-chloro-4-phenyl-2 (1H)-pyridone (I) with ethylenediamine, 2-amino-ethanethiol or o-aminothiophenol gives condensed heterocyclic pyridones such as imidazopyridone (IV), thiazolopyridone (X) or benzothiazolopyridone (XV). This reaction is considered to proceed by ring transformation of an intermediate of the Smiles rearrangement. Some of these pyridone derivatives showed strong biological activities as analgesic and antiinflammatory agents.
A reagent is described for incorporating phosphorylation sites into compounds, particularly into proteins and peptides. The reagent has the structure
A—B—C
wherein A is a moiety that is specifically reactive with a reactive side chain in the compound, B is a linking moiety, and C is a peptide sequence that contains a kinase substrate.
Compounds of general formula: ##STR1## are topically effective carbonic anhydrase inhibitors useful in the treatment of ocular hypertension and related disorders such as glaucoma.