自希波克拉底时代以来,马兜铃属植物已被推荐用于治疗各种人类疾病。然而,许多物种会产生剧毒的马兜铃酸 (AAs),这些物质既具有肾毒性又具有致癌性。为了进行广泛的生物学研究,主要基于 Suzuki-Miyaura 偶联反应设计了一种合成 AA 及其主要代谢物的通用方法。成功的关键在于制备一种常见的环-A 前体,即 2-硝基甲基-3-碘-4,5-亚甲基二氧基苯甲醇 ( 27 )的四氢吡喃醚,它是通过氧化醛肟前体26.铃木-宫浦联轴器27与各种苯甲醛 2-硼酸酯的反应伴随着羟醛缩合/消除反应,直接得到所需的菲中间体。苯甲醇的脱保护,然后是两个连续的氧化步骤,得到所需的菲硝基羧酸。该方法用于合成 AA I-IV 和其他几种相关化合物,包括在 6 位带有氨基丙氧基的 A I 和 AA II,它们是进一步转化为荧光生物探针所必需的。Suzuki-Miyaura 偶联反应进一步成功应用于合成AA I 和
Construction of Spirofused Tricyclic Frameworks by NHC-Catalyzed Intramolecular Stetter Reaction of a Benzaldehyde Tether with a Cyclic Enone
作者:Day-Shin Hsu、Chiao-Yun Cheng
DOI:10.1021/acs.joc.9b01403
日期:2019.9.6
hydrogenation. These substrates were then exposed to an N-heterocyclic carbene, whereupon intramolecular Stetterreaction proceeded smoothly to give various spirofused tricyclic 1,4-diketones in 30–87% yields. Furaldehyde and nicotinaldehyde derivatives also participated in the reaction under the Stetter conditions.
The present invention provides a compound of a formula (I):
wherein the variables are defined herein; to a process for preparing such a compound; and to the use of such a compound in the treatment of a PDE4 mediated disease state.
Chemical Compounds 637: Pyridopyrimidinediones as PDE4 Inhibitors
申请人:Bonnert Roger Victor
公开号:US20100204203A1
公开(公告)日:2010-08-12
The present invention provides a compound of a formula (I), wherein the variables are defined herein; to a process for preparing such a compound; and to the use of such a compound in the treatment of a PDE4 mediated disease state.
Isochromenylium/Isoquinolinium-Mediated One-Pot Annulation to Hexahydropyrazinoisoquinolines. Synthesis of Quinocarcinol
作者:Tianyang Wang、Yikai Wang、Donghui Feng、Min Wang、Xiaoliang Yang、Zhu-Jun Yao
DOI:10.1021/acs.orglett.3c03368
日期:2023.12.15
A novel annulation protocol has been successfully developed in this work for the quick generation of 1,3,4,6,11,11a-hexahydro-2H-pyrazino[1,2-b]isoquinolines from easily accessible o-alkynylbenzaldehydes. Various hexahydropyrazinoisoquinolines, including those previously unavailable with electron-deficient substituents, have been achieved via the newly developed continuously operational isochromen
这项工作成功开发了一种新颖的环化方案,用于从容易获得的邻炔基苯甲醛快速生成 1,3,4,6,11,11a-六氢-2 H-吡嗪基[1,2- b ]异喹啉。各种六氢吡嗪基异喹啉,包括以前无法用缺电子取代基获得的六氢吡嗪异喹啉,已经通过新开发的连续操作的异色烯鎓/异喹啉鎓介导的程序获得。它还完美地充当了新的喹啉全合成中生成基本骨架的关键步骤,同时还伴随着直接后期立体选择性 sp 3 C-H 羟甲基化的开发和应用。