Synthesis of Unsymmetrical Arylheteroarylmethanes by Direct “On Water” Cross-Coupling between Benzylic and Heteroaromatic Halides
作者:Valeria Krasovskaya、Arkady Krasovskiy、Bruce H. Lipshutz
DOI:10.1002/asia.201100153
日期:2011.8.1
Walking on water: Pharmacologically important unsymmetricalarylheteroarylmethanes are prepared by simple palladium‐catalyzed zinc‐mediated Negishi‐like cross‐couplings in good yields. This reaction tolerates various benzylic chlorides and heteroaromatic bromides “on water” and at room temperature.
A new method for the alkyl group introduction at the 3-position of pyridienes is described: Reductive disilylation of pyridine, its 2-methyl, 3-methyl, and 4-methyl derivatives affords the corresponding 1,4-disilyl-1,4-dihydropyridines. In the presence of a catalytic amount of tetrabutylammonium fluoride, these dihydropyridines smoothly react with a variety of aldehydes and ketones to give 3-alkylpyridines