Silver(I)-catalyzed reaction of terminal alkynes with (diacetoxyiodo)benzene: a convenient, efficient and clean preparation of α-acetoxy ketones
作者:Guisheng Deng、Jing Luo
DOI:10.1016/j.tet.2013.04.122
日期:2013.7
Silver(I)-catalyzed reaction of terminal alkynes with (diacetoxyiodo)benzene in wet acetonitrile at room temperature afforded the corresponding α-acetoxy ketones in 55–93% yields. The salient features of this reaction are the effective utilization of PhI(OAc)2, high chemoselectivity, excellent yields, mild reaction conditions and the experimental simplicity. A plausible mechanism has been proposed
Discovery of Novel Benzo[4,5]imidazo[1,2-<i>a</i>]pyrazin-1-amine-3-amide-one Derivatives as Anticancer Human A<sub>2A</sub> Adenosine Receptor Antagonists
blockade of A2A adenosinereceptor (A2AAR) activates immunostimulatory response through regulating signaling in tumor microenvironment. Thus, A2AAR has been proposed as a promising target for cancer immunotherapy. In this work, we designed a new series of benzo[4,5]imidazo[1,2-a]pyrazin-1-amine derivatives bearing an amide substitution at 3-position to obtain potent antitumor antagonist in vivo. The structure–activity
A 2A腺苷受体 (A 2A AR) 的阻断通过调节肿瘤微环境中的信号传导来激活免疫刺激反应。因此,A 2A AR 已被提议作为癌症免疫治疗的有希望的靶标。在这项工作中,我们设计了一系列新的苯并[4,5]咪唑并[1,2 - a ]吡嗪-1-胺衍生物,在3位具有酰胺取代,以在体内获得有效的抗肿瘤拮抗剂。通过分子建模和放射性测定进行构效关系研究。通过3',5'-环磷酸腺苷 (cAMP) 功能和 T 细胞活化测定评估体外抗癌活性。最强的化合物12o·2HCl与临床拮抗剂 AZD4635 相比,对 A 2A AR ( K i = 0.08 nM) 显示出更高的亲和力,并表现出更显着的体外免疫刺激抗癌活性。更重要的是,12o·2HCl通过逆转异种移植小鼠模型中的免疫抑制性肿瘤微环境,显着抑制三阴性乳腺癌的生长,且在试验剂量下无严重毒性。这些结果使12o·2HCl成为一种很有前途的免疫治疗抗癌药物候选者。