Several highly substitutednaphthalenes 3 have been synthesized in a one-pot reaction by treatment of arenes 1 with alkynes 2 in the presence of palladium acetate and silver acetate. In this Pd-catalyzed protocol, an arene provides a benzo source for the construction of a naphthalene core through twofold aryl C-H bond activation. Reaction of triphenylphosphine with diphenylethyne (2 a) under the catalysis
Pd-Catalyzed Oxidative Annulation of Aryl Ethers with Alkynes: Synthesis of Functionalized Spirocycles and Naphthalenes
作者:Shiyong Peng、Zhonghao Sun、Huijuan Zhu、Nuan Chen、Xiaobo Sun、Xiaojie Gong、Jian Wang、Lei Wang
DOI:10.1021/acs.orglett.0c00970
日期:2020.4.17
dearomative [2+2+1] annulations of aryl ethers with alkynes are reported via para-selective C-H functionalization, providing highly functionalized spirocyclohexadienones in moderate to excellent yields undermild reaction conditions. Importantly, mechanistic investigation indicated an unusual C-O bond cleavage was involved. Moreover, polyarylated naphthalenes could be obtained via oxidative [2+2+2] annulation
Reactive intermediates. Part XI. The generation and some reactions of benzynequinone
作者:C. W. Rees、D. E. West
DOI:10.1039/j39700000583
日期:——
5-dimethoxybenzamide. Demethylation of the former with boron tribromide, followed by oxidation with silver oxide gives 1-aminobenzotriazole-4,7-quinone which, on treatment with lead tetra-acetate yields benzynequinone, isolated as 5,6,7,8-tetraphenyl-1,4-naphthoquinone from a reaction with tetracyclone. 1-Amino-5,6-dimethoxybenzotriazole is synthesised in four steps from 4-amino-5-nitroveratrole, but attempts
Synthesis of Benzo-Fused Cyclic Compounds via Rhodium-Catalyzed Decarboxylative Coupling of Aromatic Carboxylic Acids with Alkynes
作者:Tetsuya Satoh、Yasuhito Inai、Yoshinosuke Usuki
DOI:10.1055/a-1416-6997
日期:2021.9
The decarboxylativecoupling of diversely substituted benzoic acids with internal alkynes proceeds smoothly in the presence of a [RhCl(cod)]2/1,2,3,4-tetraphenyl-1,3-cyclopentadiene catalyst system to selectively produce highly substituted naphthalene derivatives. The catalyst system is applicable to constructing anthracene and benzo[c]thiophene frameworks through reactions of naphthoic and thiophene-2-carboxylic