photocatalytic aerobicoxidative lactonization of arene C(sp2)–H bonds proceeds in the presence of 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) and tert-butyl nitrite (TBN). Under the optimized conditions, a range of 2-arylbenzoic acids is converted into the corresponding benzocoumarin derivatives in moderate to excellent yields. This method is characterized by its atom economy, mild reaction conditions, the
Cerium photocatalyzed dehydrogenative lactonization of 2-arylbenzoic acids
作者:Ketan Wadekar、Suraj Aswale、Veera Reddy Yatham
DOI:10.1039/c9ob02676b
日期:——
The first cerium photocatalyzed dehydrogenative lactonization of 2-arylbenzoic acids has been developed. This operationally simple protocol allows rapid access to synthetically useful coumarins on gram scale by employing CeCl3 as a photocatalyst and O2 as a terminal oxidant. Overall, this delivers an economical and environmentally amiable entry to diversely substituted coumarins, important structural
<i>tert</i>-Butyl Nitrite-Mediated Synthesis of <i>N</i>-Nitrosoamides, Carboxylic Acids, Benzocoumarins, and Isocoumarins from Amides
作者:Subhash L. Yedage、Bhalchandra M. Bhanage
DOI:10.1021/acs.joc.7b00570
日期:2017.6.2
(TBN) as a multitask reagent for (1) the controlled synthesis of N-nitrosoamide from N-alkyl amides, (2) hydrolysis of N-methoxyamides to carboxylic acids, (3) metal- and oxidant-free benzocoumarin synthesisfrom ortho-aryl-N-methoxyamides via N–H, C–N, and C–H bond activation, and (4) isocoumarin synthesisusingRu(II)/PEG as a recyclable catalytic system via ortho-C–H activation and TBN as an oxygen source
Novel methodology for the synthesis of the benzo[b]phenanthridine and 6H-dibenzo[c,h]chromen-6-one skeletons. Reactions of 2-naphthylbenzylamines and 2-naphthylbenzyl alcohols
作者:Priyamvada Pradeep、Kennedy J. Ngwira、Chevonne Reynolds、Amanda L. Rousseau、Andreas Lemmerer、Manuel A. Fernandes、Myron M. Johnson、Charles B. de Koning
DOI:10.1016/j.tet.2016.10.071
日期:2016.12
syntheses of both the benzo[b]phenanthridine and the 6H-dibenzo[c,h]chromen-6-one motif are described. Reaction of (2-(3-bromo-1,4-dimethoxynaphthalen-2-yl)phenyl)methanamine with PIFA afforded benzo[b]phenanthridine-7,12-dione, while the related nonbrominated precursor, (2-(1,4,5-trimethoxynaphthalen-2-yl)phenyl)methanamine on treatment with PIFA, furnished the ortho-quinone 1-methoxybenzo[c]phenanthridine-11
描述了苯并[ b ]菲啶和6 H-二苯并[ c,h ] chromen-6-一个基序的新颖合成。(2-(3-溴-1,4-二甲氧基萘-2-基)苯基)甲胺与PIFA的反应制得苯并[ b ]菲啶-7,12-二酮,而相关的非溴化前体是(2-(1,用PIFA处理4,5-三甲氧基萘-2-基)苯基)甲胺,得到邻-醌-1-甲氧基苯并[ c ]菲啶-11,12-二酮。出乎意料的是,在O 2气氛下用NBS处理相关的氧类似物,例如(2-(1,4-二甲氧基萘-2-基)苯基)甲醇,得到色酮12-甲氧基-6 H-二苯并[ c,h]] chromen-6-one。
General and Practical Carboxyl-Group-Directed Remote CH Oxygenation Reactions of Arenes
作者:Yang Wang、Anton V. Gulevich、Vladimir Gevorgyan
DOI:10.1002/chem.201303511
日期:2013.11.18
Two methods for remote aromatic CHoxygenationreactions, have been developed. Method 1, the Cu‐catalyzed oxygenationreaction, is highly efficient for cyclization of electron‐neutral and electron‐rich biaryl carboxylic acids into 3,4‐benzocoumarins. Method 2, the K2S2O8‐mediated oxygenationreaction, is more general and practical for cyclization of substrates with electron‐donating and ‐withdrawing
已经开发了两种用于远程芳族 C H 氧化反应的方法。方法 1,即 Cu 催化的氧化反应,对于将电子中性和富电子的联芳基羧酸环化为 3,4-苯香豆素非常有效。方法 2,K 2 S 2 O 8介导的氧化反应,对于具有给电子和吸电子基团的底物的环化更为通用和实用(见方案)。