作者:Dhimant Desai、Guoying Lin、Hiromi Morimoto、Philip G. Williams、Karam El- Bayoumy、Shantu Amin
DOI:10.1002/jlcr.630
日期:2002.11
Tobacco-specific N′-nitrosamines (TSNA) are a unique class of systemic organ-specific carcinogens. The TSNA are formed by N-nitrosation of nicotine and of the minor tobacco alkaloids after harvesting of tobacco and during smoking. The N-nitrosation of anatabine leads to N′-nitrosoanatabine (NAT; 1-nitroso-1,2,3,4-tetrahydro-2,3'-bipyridyl) which requires in-depth assays in laboratory animals other than the rat. Furthermore, delineation of its tissue distribution and metabolism is needed for structure:activity comparisons with other TSNA and for the assessment of potential human risk from this TSNA. We have, therefore, synthesized (±)[5-3H]NAT. 5-Bromo-3-pyridine-carboxaldehyde was condensed with ethyl carbamate prior to Diels–Alder reaction with 1,4-butadiene to give the racemic anatabine ring system. Hydrolysis, followed by reduction with LiAlT4 and nitrosation, led to (±)[5-3H]NAT (60% yield, specific activity 266 mCi/mmol, radiochemical purity of >99%). Copyright © 2002 John Wiley & Sons, Ltd.
烟草特异性N′-亚硝基胺(TSNA)是一类独特的系统性器官特异性致癌物。TSNA是在收获烟草后以及吸烟过程中,由尼古丁和少量烟草生物碱的N-亚硝基化反应形成的。阿纳塔滨的N-亚硝基化导致了N′-亚硝基阿纳塔滨(NAT;1-亚硝基-1,2,3,4-四氢-2,3'-联吡啶),这需要对除大鼠以外的实验动物进行深入检测。此外,还需要明确其组织分布和代谢,以便与其他TSNA进行结构活性比较,并评估这一TSNA对人类潜在风险。因此,我们合成了(±)[5-3H]NAT。5-溴-3-吡啶甲醛与乙基氨基甲酸酯缩合后,与1,4-丁二烯进行Diels–Alder反应,得到了外消旋的阿纳塔滨环系统。水解后,经过锂铝氢还原和亚硝化反应,得到了(±)[5-3H]NAT(产率60%,比活度266 mCi/mmol,放射化学纯度>99%)。版权 © 2002 John Wiley & Sons, Ltd.