通过修饰的Sanford反应制备10-羟基苯并[ h ]喹啉家族的类似物及其激发态的分子内质子转移性质
摘要:
我们已经开发出一种高度优化的方法,该方法可以对空间和电子上要求较高的苯并[ h ]喹啉类似物进行氧化乙酰氧基化。通过检查各种反应参数(溶剂,氧化剂,催化剂,温度,时间),确定了OAc基团插入的最佳条件。确定的条件(Pd(OAc)2,PhI(OAc)2,MeCN,150°C,16 h),再加上乙酸酯的水解,导致羟基苯并喹啉的形成,产率为27-59%,而所有先前发表的方法均无效。该合成与各种功能(酯,醛,碳-碳三键)兼容,最重要的是,它可用于位阻类似物以及在各个位置具有给电子和吸电子取代基的化合物。所有获得的化合物均表现出激发态的分子内质子转移(ESIPT),表现为较小的荧光量子产率和较大的斯托克斯位移(8300–9660 cm –1)。八个10-羟基苯并[ h的结构变化的影响对]喹啉类似物的吸收和发射性质进行了详细研究。
An efficient palladium-catalyzed nucleophilic substitution/C–H activation/aromatization cascade reaction between readily available 2-halo-N-Ms-arylamines (Ms = methanesulfonyl) and benzyl halides/sulfonates has been described. A wide variety of phenanthridines were synthesized in a one-pot fashion in moderate to high yields (37–86 %). Notably, this method provides a straightforward, facile approach
Expeditious Approach to Pyrrolophenanthridones, Phenanthridines, and Benzo[<i>c</i>]phenanthridines via Organocatalytic Direct Biaryl-Coupling Promoted by Potassium<i>tert</i>-Butoxide
作者:Subhadip De、Sourabh Mishra、Badrinath N. Kakde、Dhananjay Dey、Alakesh Bisai
DOI:10.1021/jo400890k
日期:2013.8.16
intramolecular homolytic aromatic substitution (HAS). Interestingly, this biaryl coupling also works in the presence of potassium tert-butoxide as sole promoter. On extending our approach further, we found that N-acyl 2-bromo-N-arylbenzylamines undergo a one-pot N-deprotection/biaryl coupling followed by oxidation, thus offering an expeditious route to the phenanthridine and benzo[c]phenanthridine skeletons. The
在叔丁醇钾和有机分子作为催化剂存在的情况下,已经开发出一种涉及邻卤代N芳基苄胺的“无过渡金属”分子内联芳基偶合的方法。该反应似乎通过KO t Bu促进的分子内均溶芳族取代(HAS)进行。有趣的是,这种联芳基偶合在叔丁醇钾作为唯一促进剂的情况下也起作用。在进一步扩展我们的方法时,我们发现N-酰基2-溴-N-芳基苄胺经历了一锅N-脱保护/联芳基偶联,然后进行氧化,因此提供了通往菲啶和苯并[ c ]菲啶骨架的快速途径。该策略已被应用于简明的金莲花科生物碱的合成。oxoassoanine(1B),anhydrolycorinone(1D),5,6- dihydrobicolorine(2D),trispheridine(2B),和苯并[ C ^ ]菲啶生物碱dihydronitidine(图3b),dihydrochelerythidine(3D),dihydroavicine(3F),norni
Visible-Light-Promoted Iminyl-Radical Formation from Acyl Oximes: A Unified Approach to Pyridines, Quinolines, and Phenanthridines
iminyl‐radical formation has been established for the construction of pyridines, quinolines, and phenanthridines from acyl oximes. With fac‐[Ir(ppy)3] as a photoredox catalyst, the acyl oximes were converted by 1 e− reduction into iminyl radical intermediates, which then underwent intramolecular homolytic aromatic substitution (HAS) to give the N‐containing arenes. These reactions proceeded with a broad
已经建立了涉及可见光诱导的亚胺基自由基形成的统一策略,用于从酰基肟中构建吡啶,喹啉和菲啶。用FAC - [的Ir(ppy)3 ]作为催化剂photoredox,酰基肟通过1e中转化-还原成亚氨基自由基中间体,然后行分子内均裂芳族取代(HAS),得到含有N-芳烃其中。这些反应在室温下以宽范围的底物以高收率进行。这种可见光诱导的亚胺基自由基形成策略已成功地应用于五步精简合成苯并[ c ]菲啶生物碱。
Oxygen‐Linked Cyclopentadienyl Rhodium(III) Complexes‐Catalyzed Asymmetric C−H Arylation of Benzo[
<i>h</i>
]quinolines with 1‐Diazonaphthoquinones
作者:Chongqing Pan、Si‐Yong Yin、Shao‐Bo Wang、Qing Gu、Shu‐Li You
DOI:10.1002/anie.202103638
日期:2021.7.5
functionalization reactions have witnessed a significant progress in organic synthesis. In sharp contrast, the reported chiral Cp ligands are limited to C-linked Cp and are often synthetically challenging. To address these issues, we have developed a novel class of tunable chiral cyclopentadienyl ligands bearing oxygen linkers, which were efficient catalysts for C−H arylation of benzo[h]quinolines with
PROCESS FOR PRODUCING BENZOÝc¨PHENANTHRIDINE DERIVATIVE
申请人:NIPPON KAYAKU KABUSHIKI KAISHA
公开号:EP1813617A1
公开(公告)日:2007-08-01
A compound represented by the following formula (1): [wherein R1 and R2 each independently represents hydroxy, provided that R1 and R2 may be bonded to each other to form methylenedioxy, etc.; X represents halogeno; and R3 represents a protective group] is subjected to a cyclization reaction with the aid of an organic silyl hydride and then aromatized with an oxidizing agent to produce a benzo[c]phenanthridine derivative represented by the following formula (2): [wherein R1, R2, and R3 have the same meanings as defined above].