Abstract The 3-allyl-2-methylquinazolin-4 (3H)-one (1), a model functionalized terminal olefin, was submitted to hydroformylation and reductive amination under optimized reaction conditions. The catalytic carbonylation of 1 in the presence of Rh catalysts complexed with phosphorus ligands under different reaction conditions afforded a mixture of 2-methyl-4- oxoquinazoline-3 (4H)-butanal (2) and α, 2-dimethyl-4-oxoquinazoline-3 (4H)-propanal (3 ...