抗辐射药物2,2-二甲基四氢噻唑及胱胺有机酸盐的研究

为了改善２，２－二甲基四氢噻唑盐酸盐（ＤＭＴＤ）的理化性质及提高辐射防护效价。方法合成了ＤＭＴＤ和胱胺的各种有机酸盐，对９．０３Ｇｙ６０Ｃｏγ射线一次全身照射的小鼠，照前给药，评价它们的辐射防护效果。结果大部分化合物具有不同程度的防护效果，其中ＤＭＴＤ酒石酸盐２５０ｍｇ／ｋｇ，照前一小时腹腔注射，存活率比单独照射对照组提高４０％；胱胺琥珀酸盐２５０ｍｇ／ｋｇ，照前１５分钟腹腔注射，存活率净增加７７．５％。结论胱胺琥珀酸盐的辐射防护效果显著，值得进一步研究     

噻唑烷二酮类药物治疗2型糖尿病的效果

噻唑烷二酮类药物是目前治疗糖尿病的主要药物之一,该类药物可增强机体胰岛素敏感性,降低胰岛素抵抗,在降糖效果上与磺脲类和二甲双胍类相当,但对胰岛B细胞的保护性远远要好于磺脲类和二甲双胍类,而且对心血管有着良好的保护作用。噻唑烷二酮类药物最主要的副作用是水肿和皮下脂肪增多。     

含硫亚硝基脲衍生物

本文报道一系列含硫亚硝基脲衍生物的合成、光谱学特征及对小鼠白血病L1210的作用。这些化合物都是CNC-半胱胺的衍生物,包括二硫化合物、2-氯乙基氨甲酸酯衍生物以及与羰基化合物环合而成的2,2-二取代的CNC-四氢噻唑。CNC-半胱胺及其二硫化合物、CNC-胱胺甲酰叠氮均有良好的抗L1210的作用;相应的氨甲酸酯衍生物和四氢噻唑衍生物的作用不明显。值得注意的是,2-甲基-2-乙氧羰甲基-3-CNC-四氢噻唑(15b)是一个例外,它对L1210有显著的抑制作用。     

Design and synthesis of some substituted 1H-pyrazolyl-oxazolidines or 1H-pyrazolyl-thiazolidines as anti-inflammatory-antimicrobial agents

Four series of 1 H-pyrazole derivatives have been synthesized. The first series was synthesized starting with the reaction of 3-(5-bromo-2-thienyl)-1-phenyl-1 H-pyrazole-4-carboxaldehyde 1 with L-serine, L-cysteine, or L-penicillamine, followed by N-protection using (Boc)(2)O to provide compounds 2. The latter compounds could be N-deprotected by 4N HCl/dioxane to afford the second series 3 or reacted with NH(4)OH in the presence of DCC/HOBt to give the corresponding amides 4 followed by N-deprotection giving rise to compounds 5. The newly synthesized compounds were evaluated for their anti-inflammatory-antimicrobial activities. In addition, the ulcerogenic and acute toxicity profiles were determined. Compound 5b (2RS, 4R)-2-[3-(5-bromo-2-thienyl)-1-phenyl-1H-pyrazol-4-yl]-5-methylthiazolidine-4-carboxamide, proved to be the most active anti-inflammatory-antimicrobial agent in the present study with a good safety margin and no ulcerogenic effect.     

Synthesis and in vitro antibacterial evaluation of novel imidazo[2',1':5,1]-1,2,4-triazolo[4,3-c]-quinazoline derivatives of 5-thioxo-1, 2, 4-triazole, 4-oxothiazolidine, and their open-chain counterparts

Two novel series of imidazo[2', 1':5, 1]-1, 2, 4-triazolo[4, 3-c]quinazolines bearing 5-thioxo-1, 2, 4-triazoles, 6a-f, and 4-oxothiazolidines, 7a-f, were synthesized from corresponding thiosemicarbazide derivatives, 5a-f. The stepwise methodology applied to the preparation of compounds 5a-f was initiated with reaction of the parent 3-amino-1, 2, 4-triazolo[4, 3-c]quinazolines, 2, with ethyl 2-chloroacetoacetate resulting in annelation of the imidazole ring to give esters, 3a-c. However, hydrazinolysis of these ester derivatives gave the corresponding acid hydrazides, 4a-c, which on reaction with the appropriate alkyl isothiocyanate yielded compounds 5a-f. In turn, compounds 5, were cyclized with potassium hydroxide or with ethyl bromoacetate to give the corresponding thioxotriazoles 6 and oxothiazolidines 7, respectively. All synthesized compounds were screened for their in vitro antibacterial activity against various Gram-positive and Gram-negative bacteria. Some test compounds were found to possess potent antibacterial activities. Compound, 7f, exhibited much higher potency than the reference standard ciprofloxacin, against both types of bacteria, particularly, Gram-positive organisms.