Model studies towards prodrugs of the glutamine antagonist 6-diazo-5-oxo-l-norleucine (DON) containing a diazo precursor.

Model studies towards prodrugs of the glutamine antagonist 6-diazo-5-oxo-l-norleucine (DON) containing a diazo precursor.
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对谷氨酰胺拮抗剂的前药6-二二氮-5-氧气-L-甲乳糖明(DON)的模型研究。

DOI:
10.1016/j.bmcl.2021.128321
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发表时间:
2021-10-15
影响因子:
2.7
通讯作者:
Tsukamoto T
Tsukamoto T
中科院分区:
医学4区
文献类型:
--
作者:
Gao RD;Hin N;Prchalová E;Pal A;Lam J;Rais R;Slusher BS;Tsukamoto T

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研究了咪唑四嗪和亚硝酰胺两种不同的重氮前体在谷氨酰胺拮抗剂6-重氮-5-氧代-1-正亮氨酸(DON)前药设计中的作用。作为基于咪唑四嗪的前药的模型,我们合成了(S)-2-乙酰氨基-6-(8-氨基甲酰基-4-氧代咪唑并[5,1-d][1,2,3,5]四嗪-3(4 H)-基)-5-氧代己酸(4),其含有替莫唑胺的整个支架,替莫唑胺是临床上批准用于治疗多形性胶质母细胞瘤的DNA甲基化剂的前体。对于基于亚硝酰胺的前药,我们合成了含有N-亚硝基氨基甲酸酯基团的2-乙酰氨基-6-(苄氧基)羰基)(亚硝基)氨基)-5-氧代己酸(5),其可以通过与链脲霉素(一种临床批准的含有N-亚硝基脲基团的重氮甲烷释放药物)类似的机制转化为重氮部分。初步表征证实了由化合物4以pH依赖性方式形成N-乙酰基DON(6),也称为杜氮霉素A,而化合物5没有表现出足够的稳定性以允许进一步表征。综上所述,我们的模型研究表明,需要进一步的改进,将这种前药的方法转化为谷氨酰胺拮抗剂为基础的治疗。
Two distinct diazo precursors, imidazotetrazine and nitrous amide, were explored as promoieties in designing prodrugs of 6-diazo-5-oxo-l-norleucine (DON), a glutamine antagonist. As a model for an imidazotetrazine-based prodrug, we synthesized (S)-2-acetamido-6-(8-carbamoyl-4-oxoimidazo[5,1-d][1,2,3,5]tetrazin-3(4H)-yl)-5-oxohexanoic acid (4) containing the entire scaffold of temozolomide, a precursor of the DNA-methylating agent clinically approved for the treatment of glioblastoma multiforme. For a nitrous amide-based prodrug, we synthesized 2-acetamido-6-(((benzyloxy)carbonyl)(nitroso)amino)-5-oxohexanoic acid (5) containing a N-nitrosocarbamate group, which can be converted to a diazo moiety via a mechanism similar to that of streptozotocin, a clinically approved diazomethane-releasing drug containing an N-nitrosourea group. Preliminary characterization confirmed formation of N-acetyl DON (6), also known as duazomycin A, from compound 4 in a pH-dependent manner while compound 5 did not exhibit sufficient stability to allow further characterization. Taken together, our model studies suggest that further improvements are needed to translate this prodrug approach into glutamine antagonist-based therapy.
DOI: 10.1021/acs.jmedchem.7b00966
发表时间: 2017-08-24
影响因子: 7.3
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