Different bonds cleavage of arenesulfonates: access to diverse aryl ethers was written by Fang, Yongsheng;Li, Wenhui;Lin, Jianying;Li, Xing. And the article was included in Huaxue Xuebao in 2021.Computed Properties of C5H5NO This article mentions the following:
Aryl alkyl ethers and diaryl ethers represent ubiquitous structural motifs in natural products, medicinally relevant compounds, biol. active compounds, agrochems. and organic materials, and they are also useful building blocks in organic synthesis. Therefore, many transformations have been reported for the synthesis of these two kinds of compounds Among these versatile methods, transition-metal-free approaches using different reagents as starting materials have been developed as promising and alternative protocols. Although one example for transition-metal-catalyzed transformation of arenesulfonates into aryl alkyl ethers and diaryl ethers has been reported, there are no reports about the formation of aryl ethers utilizing arenesulfonates as starting materials via a transition-metal-free protocol, and existing methods for providing sterically hindered ortho-substituted diaryl ethers using electrophiles substituted by electron-deficient groups, particularly by a bulky one at the ortho-position as starting materials are very rare. We will report a K2CO3-mediated method for the synthesis of aryl alkyl ethers using arenesulfonates as starting materials via two alternative paths. One path is the cross-coupling of aryl arenesulfonates with alcs. through their S-O bond cleavage, and the other uses the reactions of alkyl arenesulfonates with phenols via their C-O bond cleavage. Addnl., we also report the K3PO4–promoted preparation of bulky ortho-substituted diaryl ethers via the C-S bond cleavage of aryl arenesulfonates or arenesulfonyl chlorides bearing electron-withdrawing groups at 2-, 2,4- or 2,6-position of the Ph ring in the presence of phenols, resp. General procedure for the reactions of aryl arenesulfonates with various alcs.: to an oven-dried glass tube, aryl arenesulfonate 1 (0.2 mmol), K2CO3 (2 equivalent) and 0.5 mL alc. 2 were added in turn. The reaction system was then stirred at 65°C until the aryl arenesulfonate 1 was completely consumed as determined by thin layer chromatog. Finally, the reaction mixture was purified by silica gel column chromatog. to afford the desired product 3. General procedure for the reactions of aryl o-substituted arenesulfonates with the corresponding phenols: to an oven-dried glass tube, aryl o-substituted arenesulfonate 7 (0.2 mmol), K3PO4 (3 equivalent), the corresponding phenol 5 (1.2 equivalent) and 1.0 mL toluene were added in turn. The reaction system was then stirred at 100°C until the reaction was over as determined by TLC. Finally, the reaction mixture was purified by silica gel column chromatog. to afford the desired product 8. In the experiment, the researchers used many compounds, for example, Pyridin-4-ol (cas: 626-64-2Computed Properties of C5H5NO).
Pyridin-4-ol (cas: 626-64-2) belongs to pyridine derivatives. Pyridine’s the lone pair does not contribute to the aromatic system but importantly influences the chemical properties of pyridine, as it easily supports bond formation via an electrophilic attack. Pyridine, its benzo and pyridine-based compounds play diverse roles in organic chemistry. Pyridine-based materials are valued for their optical and physical properties as well as their medical potential. Computed Properties of C5H5NO