Abstract A number of new angular 2-morpholino-(substituted)-naphth-1, 3-oxazines (compound 10b), linear 2-morpholino-(substituted)-naphth-1, 3-oxazines (compounds 13b– c), linear 6, 7 and 9-O-substituted-2-morpholino-(substituted)-naphth-1, 3-oxazines (compounds 17–22, 24, and 25) and angular compounds 14–16 and 23 were synthesised. The O-substituent was pyridin-2yl-methyl (15, 18, and 21) pyridin-3yl-methyl (16, 19, and ...