A dichotomy in the Friedel-Crafts reactions of lactones provides a convenient new route to 2-acylated pyrroles and tetrahydroindolones
作者:David C. Harrowven、Richard F. Dainty
DOI:10.1016/00404-0399(50)1328-f
日期:1995.9
In striking contrast to arenes, N-methylpyrrole undergoes Friedel-Crafts acylation with lactones. The reaction is most efficient with γ- and δ-lactones; ε-lactones proceed with poor overall conversion while β-lactones display poor selectivity. γ-Alkyl-γ-lactones readily yield 4,5,6,7-tetrahydroindol-7-ones through a sequence analogous to the Truce-Olson annulation.
strategy for oxidative Csp2-H arylation of electron-rich furans and pyrroles has been achieved with the aid of remote carbonyl-containing groups. These groups enable the Pd-catalyzed oxidative Csp2-H arylation of furans to proceed under a warm temperature and O2 atmosphere, while distinctly promoting the yield of such a reaction for pyrroles. Supported by the experimental results and density functional
借助远程含羰基基团,已经实现了富电子呋喃和吡咯的氧化 C sp2 -H 芳基化的温和策略。这些基团使 Pd 催化的呋喃氧化 C sp2 -H 芳基化能够在温暖的温度和 O 2下进行气氛,同时明显提高吡咯反应的产率。在实验结果和密度泛函理论计算的支持下,针对这些转换提出了一个原始概念,即远程组辅助 Heck 型路径。此外,发现包括芳基硼酸在内的富电子底物作为芳基化试剂具有良好的耐受性,该策略也已应用于合成 S-亚硝基谷胱甘肽还原酶抑制剂骨架的替代途径。
Design and synthesis of novel benzimidazole derivatives as inhibitors of hepatitis B virus
作者:Yu Luo、Jia-Ping Yao、Li Yang、Chun-Lan Feng、Wei Tang、Gui-Feng Wang、Jian-Pin Zuo、Wei Lu
DOI:10.1016/j.bmc.2010.05.076
日期:2010.7
A series of novel benzimidazole derivatives were synthesized and evaluated for their anti-hepatitis B virus (HBV) activity and cytotoxicity in the HepG2.2.15 cell line. The preliminary SAR was discussed. Compound 12a, with IC50 < 0.41 mu M and SI > 81.2, was the most promising compound and selected as the benchmark compound for further optimization. (C) 2010 Elsevier Ltd. All rights reserved.