Chemical Library and Structure–Activity Relationships of 11-Demethyl-12-oxo Calanolide A Analogues as Anti-HIV-1 Agents
作者:Tao Ma、Li Liu、Hai Xue、Li Li、Chunyan Han、Lin Wang、Zhiwei Chen、Gang Liu
DOI:10.1021/jm701405p
日期:2008.3.13
(+)-Calanolide A (1) as a natural product was previously found as an inhibitor of HIV-1 reverse tratiscriptase. In our further investigation of its template, racemic 11-demethyl-12-oxo calanolide A (15), which had two fewer chiral carbon centers at the C-11 and C-12 positions than (+)-calanolide A, had a comparably inhibitory activity and better therapeutic index (EC(50) = 0.11 mu M, TI = 818) against HIV-1 in vitro. A library based on its structural core was then designed and synthesized with introduction of nine diversity points in this article. The evaluations of anti-HIV-1 activity in vitro concluded their structure-activity relationships (SARs). A novel compound (10-bromomethyl-11-demethyl-12-oxo calanolide A, 123) was identified to have much higher inhibitory potency and therapeutic index (EC(50) = 2.85 nM, TI > 10,526) than those of the class compound against HIV-1. This finding provided a very important clue that modifications of the C ring at the C-10 position may be conducted to obtain drug candidates with better activity against HIV-1.
(+)-Calanolide A (1) 作为一种天然产物,先前被发现是HIV-1逆转录酶的抑制剂。在我们对其模板的进一步研究中,外消旋的11-去甲基-12-酮基calanolide A (15) 被发现。与(+)-calanolide A相比,它在C-11和C-12位上少两个手性碳中心,但其对HIV-1的抑制活性相当,并且具有更好的治疗指数(EC(50) = 0.11 μM,TI = 818)。随后,基于其结构核心设计并合成了一个化合物库,并在本文中引入了九个多样性点。体外评估抗HIV-1活性得出了它们的结构-活性关系(SARs)。发现了一个新的化合物(10-溴甲基-11-去甲基-12-酮基calanolide A,123),其对HIV-1的抑制效力和治疗指数(EC(50) = 2.85 nM,TI > 10,526)显著高于该类化合物。这一发现提供了非常重要的线索,即对C环的C-10位进行修饰,可能会得到对HIV-1活性更好的药物候选物。