N-Benzyl-2-nitrobenzenesulfonamides underwent base-mediated intramolecular arylation at the benzyl sp(3) carbon to yield benzhydrylamines. The presence of electron withdrawing groups on the aromatic ring of the benzyl group was required to facilitate the C-arylation. Unsymmetrically substituted benzhydrylamines are advanced intermediates toward nitrogenous heterocycles, as exemplified in the syntheses of indazole oxides and quinazolines.
- MeSH
- alkoholy chemie MeSH
- benzhydrylové sloučeniny chemie MeSH
- benzylové sloučeniny chemie MeSH
- chinazoliny chemická syntéza MeSH
- heterocyklické sloučeniny chemická syntéza MeSH
- indazoly chemická syntéza MeSH
- indikátory a reagencie MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
N-Unsubstituted indazoles 3 and 1-arylindazoles 4 are readily available in good to high yields through [3+2] cycloaddition of 2-(trimethylsilyl)aryl triflates 1 and diazo compounds in the presence of KF or CsF under mild reaction conditions. Furthermore, we found that azomethine imides also underwent cycloaddition reaction with 2-(trimethylsilyl)phenyl triflates (1a) in the presence of KF to afford indazolone derivatives 6 in moderate yields.
