Pyridine sulfinates as general nucleophilic coupling partners in palladium-catalyzed cross-coupling reactions with aryl halides
作者:Tim Markovic、Benjamin N. Rocke、David C. Blakemore、Vincent Mascitti、Michael C. Willis
DOI:10.1039/c7sc00675f
日期:——
Pyridine rings are ubiquitous in drug molecules; however, the pre-eminent reaction used to form carbon–carbon bonds in the pharmaceutical industry, the Suzuki–Miyaura cross-couplingreaction, often fails when applied to these structures. This phenomenon is most pronounced in 2-substituted pyridines, and results from the difficulty in preparing, the poor stability of, and low efficiency in reactions
Nickel(II)-Catalyzed Synthesis of Sulfinates from Aryl and Heteroaryl Boronic Acids and the Sulfur Dioxide Surrogate DABSO
作者:Pui Kin Tony Lo、Yiding Chen、Michael C. Willis
DOI:10.1021/acscatal.9b04363
日期:2019.12.6
We report a redox-neutral Ni(II)-catalyzed sulfination of readily available aryl and heteroaryl boronicacids. Using the combination of commercially available, air-stable NiBr2·(glyme), a commercially available phenanthroline ligand, and DABSO, boronicacids are efficiently converted to the corresponding sulfinate salts, which can be further elaborated to valuable sulfonyl-containing groups, including