Thiamine hydrochloride (1a; 3-[(4-amino-2-methylpyrimidin-5-yl)methyl]-5-(2-hydroxyethyl)-4-methylthia-zolium chloride hydrochloride; vitamin B1) has been synthesized in excellent yield by condensation of 3-mercapto-4-oxopentyl acetate (5a) with 3, 4-dihydro-7-methylpyrimido[4, 5-d]pyrimidine (4) in formic acid. The two intermediates 5a and 4 are prepared from 3-chloro-4-oxopentyl acetate (3) and
合成了硫胺盐酸盐(1a ; 3-[((4-氨基-2-甲基嘧啶-5-基)甲基] -5-(2-羟乙基)-4-甲基噻唑盐酸盐;维生素B 1)的合成产率极高乙酸3-巯基-4-氧戊酯(5a)与3,4-二氢-7-甲基嘧啶[4,5- d ]嘧啶(4)在甲酸中的缩合反应。两种中间体5a和4分别由乙酸3-氯-4-氧戊酯(3)和4-氨基-2-甲基-5-(氨基甲基)-嘧啶(Grewe diamine;2a)制备。
[EN] METHOD FOR PREPARATION OF THIAZOLE DERIVATIVES<br/>[FR] PROCÉDÉ POUR LA PRÉPARATION DE DÉRIVÉS DE THIAZOLE
申请人:DSM IP ASSETS BV
公开号:WO2014029320A1
公开(公告)日:2014-02-27
A method for the preparation of a thiazole compound of formula (I) comprises reacting a compound of formula (II) with a compound of formula (III) in a solvent containing formic acid.
Determination of Pre-Steady-State Rate Constants on the Escherichia coli Pyruvate Dehydrogenase Complex Reveals That Loop Movement Controls the Rate-Limiting Step
作者:Anand Balakrishnan、Natalia S. Nemeria、Sumit Chakraborty、Lazaros Kakalis、Frank Jordan
DOI:10.1021/ja3062375
日期:2012.11.14
binding to thiamindiphosphate (ThDP), play a critical role in modulation of the catalytic cycle of PDHc. To test our hypothesis, we kinetically characterized ThDP-bound covalentintermediates on the E1p component, and the lipoamide-bound covalentintermediate on the E2p component in PDHc and in its variants with disrupted active-site loops. Our results suggest that formation of the first covalent predecarboxylation
[EN] Novel synthesis of substituted 4-amino-pyrimidines<br/>[FR] NOUVELLE SYNTHÈSE D'AMINO-4 PYRIMIDINES SUBSTITUÉES
申请人:DSM IP ASSETS BV
公开号:WO2010010113A1
公开(公告)日:2010-01-28
The present invention is directed to a process for the manufacture of compounds of formula IV wherein R1 is an amino protecting group, and R2 is hydrogen or C1-10 alkyl, comprising a) reacting a compound of formula Ia, wherein M+ is a cation, preferably selected from the group consisting of Li+, Na+, K+, 1/2 Mg2+ and 1/2 Zn2+, (formula 1a) with an ammonium salt NH4+X-, wherein X- is an anion, preferably selected from the group consisting of chloride, bromide, sulfate and acetate, in a solvent to a compound of formula II b) reacting a compound of formula II with a nitrile R2-CN in the presence of a base to a compound of formula IV. The present invention is further directed to compounds of formula II and their use for the manufacture of vitamin B1.
Non-charged thiamine analogs as inhibitors of enzyme transketolase
作者:Allen A. Thomas、J. De Meese、Y. Le Huerou、Steven A. Boyd、Todd T. Romoff、Steven S. Gonzales、Indrani Gunawardana、Tomas Kaplan、Francis Sullivan、Kevin Condroski、Joseph P. Lyssikatos、Thomas D. Aicher、Josh Ballard、Bryan Bernat、Walter DeWolf、May Han、Christine Lemieux、Darin Smith、Solly Weiler、S. Kirk Wright、Guy Vigers、Barb Brandhuber
DOI:10.1016/j.bmcl.2007.11.098
日期:2008.1
Inhibition of the thiamine-utilizing enzyme transketolase (TK) has been linked with diminished tumor cell proliferation. Most thiamine antagonists have a permanent positive charge on the B-ring, and it has been suggested that this charge is required for diphosphorylation by thiamine pyrophosphokinase (TPPK) and binding to TK. We sought to make neutral thiazolium replacements that would be substrates for TPPK, while not necessarily needing thiamine transporters (ThTr1 and ThTr2) for cell penetration. The synthesis, SAR, and structure-based rationale for highly potent non-thiazolium TK antagonists are presented. (c) 2007 Elsevier Ltd. All rights reserved.