Silver-Mediated Oxidative Decarboxylative Intramolecular Asymmetric Radical Cyclization (C<sub>sp3</sub>–C<sub>sp2</sub>) via Memory of Chirality: Access to Circumdatin Alkaloids
作者:Pankaj S. Mahajan、Santosh B. Mhaske
DOI:10.1021/acs.orglett.8b00652
日期:2018.4.6
A novel silver-mediated oxidative decarboxylativeintramolecular asymmetric radical cyclization has been developed to form a Csp3–Csp2 bond via memory of chirality. The application of the process has been demonstrated for the synthesis of the circumdatin class of alkaloids in high enantiopurity with retention of the configuration. The developed protocol is mild and works with an inexpensive silver
First Total Synthesis of (-)-Circumdatin H, a Novel Mitochondrial NADH Oxidase Inhibitor
作者:D. Bose、M. Chary
DOI:10.1055/s-0029-1218606
日期:2010.2
convergent synthesis of the mitochondrial NADH oxidase inhibitor (-)-circumdatin H is described. The strategy employs the intramolecular Eguchi aza-Wittig protocol as a key step to install the crucial central core BC ring system, leading to the firsttotalsynthesis of the target molecule. benzodiazepine alkaloids - circumdatin H - mitochondrial NADH oxidase - intramolecular aza-Wittig reaction - Eguchi
A facial synthesis of quinazolino[1,4]benzodiazepine alkaloids via reductive N-heterocyclization of N-(2-nitrobenzoyl)amides: total synthesis of asperlicin C, circumdatin H, and its analogues
作者:Naim H. Al-Said、Khaled Q. Shawakfeh、Mohammad I. Ibrahim、Sami H. Tayyem
DOI:10.3998/ark.5550190.0011.926
日期:——
A facile and short synthesis of a series of quinazolino[1,4]benzodiazepinealkaloids, including asperlicin C, circumdatin H and some analogues, is reported utilizing coupling of readily available [1,4]benzodiazepine with 2-nitrobenzoyl chlorides, followed by a reductive Nheterocyclization.
据报道,利用现成的 [1,4] 苯二氮卓类与 2-硝基苯甲酰氯的偶联,可以简便且快速地合成一系列喹唑啉并 [1,4] 苯二氮卓类生物碱,包括阿斯帕林 C、环菌素 H 和一些类似物。还原性杂环化。
Low-Valent Titanium-Mediated Enantioselective Synthesis of Quinazolinone Alkaloids Circumdatins F, H, and Analogs
作者:Shi-Peng Luo、Hui Geng、Yu Wang、Pei-Qiang Huang
DOI:10.1002/cjoc.201400849
日期:2015.6
We report the concise and protecting‐group‐free enantioselective total syntheses of circumdatinsF and H. In view of the extreme importance of analogs of quinazolinone alkaloids in drug research and discovery, four analogs of bioactive quinazolinobenzodiazepine alkaloids, including demethoxycircumdatin H (12) and N‐demethylbenzomalvin A (13), have been synthesized. The method is based on the low‐valent
我们报告了简明的和无保护基团的对映体F和H的对映选择性总合成。鉴于喹唑啉酮生物碱的类似物在药物研究和发现中极为重要,因此有四种生物活性喹唑啉酮苯二氮卓生物碱的类似物,包括脱甲氧基环丁啶H(12)和N-去甲基苯并丙氨酸A(13)已合成。该方法基于酰亚胺与邻硝基苯甲酰亚胺的低价钛促进的分子内还原偶联,在温和条件下可生成喹唑啉代[3,2- a ] [1,4]苯并二氮杂pine。此外,七环脱水紫精素E(16)是通过NCS介导的脱水环化反应从阿斯匹林菌素C合成的。
A concise synthesis of enantiopure circumdatins E, H and J
作者:Paul E. Zhichkin、Xiaomin Jin、Honglu Zhang、Lisa H. Peterson、Catherine Ramirez、Tara M. Snyder、Hilde S. Burton
DOI:10.1039/b925494c
日期:——
A concise total synthesis of enantiopure circumdatins E, H and J has been developed using a reductive cyclization of chiral N-prolinoyl-2-nitrobenzamides to construct the core quinazolinone ring.