Abstract
We report here a Ni-NPs-catalyzed one-pot synthesis of 2-alkyl/aryl quinazolinone
motifs via acceptorless dehydrogenation of alcohol, condensation of an aldehyde intermediate
with 2-aminobenzamide, followed by a second dehydrogenation of the cyclized intermediate.
The protocol is atom-economical and require earth-abundant Ni as the catalyst. The
present report involves the annulation of 2-aminobenzamide with various types of primary
alcohols, including aryl/heteroaryl methanol, and aliphatic alcohols, and produces
high yields of the desired products under neat conditions. The catalyst was synthesized
via a high-temperature pyrolysis strategy, using ZIF-8 as the sacrificial template. The
Ni NPs@N-C catalyst was characterized by XPS, HR-TEM, HAADF-STEM, XRD, and ICP-MS.
The catalyst is stable even in air at room temperature and displayed excellent activity
in the acceptorless dehydrogenative coupling synthesis of quinazolinones and could
be recycled five times without appreciable loss of its activity.
Key words
acceptorless dehydrogenation - alkyl/aryl quinazolinone - nitrogen-doped carbon -
Ni nanoparticles - solvent-free protocol