Base-promoted, deborylative secondary alkylation of N-heteroaromatic N-oxides with internal gem-bis[(pinacolato)boryl]alkanes: a facile derivatization of 2,2′-bipyridyl analogues
作者:Chiwon Hwang、Woohyun Jo、Seung Hwan Cho
DOI:10.1039/c7cc03731g
日期:——
A base-promoted, secondary alkylation of N-heteroaromatic N-oxides using internal gem-bis[(pinacolato)boryl]alkanes as alkylation reagents is reported. The reaction exhibit broad scope, providing deoxygenated secondary alkylated N-heteroaromatic compounds with high efficiency. The usefulness of the developed protocol is evidenced by sequential direct alkylation of 2,2′-bipyridine-N-oxide.
Synthesis of 2-Substituted Pyridines via a Regiospecific Alkylation, Alkynylation, and Arylation of Pyridine <i>N</i>-Oxides
作者:Hans Andersson、Fredrik Almqvist、Roger Olsson
DOI:10.1021/ol070184n
日期:2007.3.1
Grignard reagents to pyridine N-oxides in THF at room temperature followed by treatment with acetic anhydride at 120 degrees C afforded 2-substitutedpyridines in good to high yields. Furthermore, by exchanging acetic anhydride for DMF in the second step, 2-substitutedpyridine N-oxides were obtained, as intermediates suitable for addition of a second Grignard reagent for the synthesis of 2,6-disubstituted