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Copper-assisted preparation of pyridinyl sulfonate esters from hydroxypyridines and sodium sulfinates†
Qian Li,Yishuai Liu,Liu Yang,Zongbo Xie,Zhang-Gao Le
RSC Advances Pub Date : 01/20/2022 00:00:00 , DOI:10.1039/D1RA08568A
Abstract

An efficient and powerful copper-assisted method for the effective conversion of a broad range of hydroxypyridines and sodium sulfinates into their corresponding pyridinyl tosylates was developed. Key features of this base- and ligand-free protocol include using the cheap and readily available CuBr2 as a medium and the use of sodium sulfinates as formal sulfonylation reagents. A variety of functional pyridinyl tosylates could be formed with good yields, which can easily be converted into C–C and C–N bond-containing compounds.

Graphical abstract: Copper-assisted preparation of pyridinyl sulfonate esters from hydroxypyridines and sodium sulfinates
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