Crystal structure of thiamine thiazolone: a possible transition-state analog with an intramolecular N-H.cntdot..cntdot..cntdot.O hydrogen bond in the V form
Studies on Pyrimidine Derivatives and Related Compounds. LIV. Reactions of Thiamine with α-Ketoaldehydes
作者:AKIRA TAKAMIZAWA、SAICHI MATSUMOTO、SHOJI SAKAI
DOI:10.1248/cpb.17.128
日期:——
Reaction of thiamine-sodium salt (III) with phenylglyoxal in the presence of carbon dioxide yielded 2-phenyloxalylthiamine (Va) which underwent facile air oxidation to thiamine thiazolone (VI) and phenylglyoxylic acid. Thiamine hydrochloride (I) was also condensed with phenylglyoxal in the presence of triethylamine or sodium hydroxide to give Va. The reaction was applied to a number of α-ketoaldehydes including some heterocyclic glyoxals to give corresponding 2-oxalylthiamine derivatives (Vb-1) which were shown to be convertible into stable acyl derivatives (XIa-r).
Reaction of -alkylthiazolium halides, including thiamine, with superoxide ion. Chemistry and biological implications.
作者:Alessandro Dondoni、Guido Galliani、Annarosa Mastellari、Alessandro Medici
DOI:10.1016/s0040-4039(00)98871-3
日期:1985.1
N-alkylthiazolium halides are transformed by KO2 into the corresponding thiazolin-2-ones and thiazolin-2-thiones; the same reactions occur with thiamine, whose thiazolin-2-one pyrophosphate has been reported to be a strong inhibitor of pyruvic dehydrogenase.
Studies on Pyrimidine Derivatives and Related Compounds. LX. Synthesis of Hydroxymethylthiamine
作者:AKIRA TAKAMIZAWA、SAICHI MATSUMOTO、SHOJI SAKAI
DOI:10.1248/cpb.17.343
日期:——
Hydroxymethylthiamine, phosphate free "active formaldehyde, " was synthesized by the acid treatment of 2-phenyloxalylthiamine-O, O'-diacetate or 2-α-furyloxalylthiamine-O, O'-diacetate, and on alkaline treatment it was converted into a dimeric 1, 4-oxazine derivative (X) involving a ring expansion and auto-oxidation.
The reactions with amines of disulphides derived from thiazolium salts. Part II. Tertiary and aromatic amines and the thiolation reaction
作者:R. G. Cooks、P. Sykes
DOI:10.1039/j39680002871
日期:——
The reaction of thiamine disulphide with triethylamine or with aniline involves nucleophilic cleavage of the disulphide bond as the primary process. Subsequent steps differ from those in the reactions of primary aliphatic amines in that the first-formed enethiol, rather than an enamine, undergoes cyclisation and thiolation to give a thiazolinethione. The source of the sulphur involved in thiolation