We described the synthesis of 6-aryl, 8- aryl, and -2-morpholino-benzoxazines as potent DNA-PK and selective over PI3K.
class="boldFont">20i (8-(Naphthalen-1-yl) showed strong anti-proliferative activity (GI% at 10 µM = 92) against A498 renal cancer cells.
class="boldFont">20k (8-Dibenzo[b,d]thiophen-4-yl) the most DNA-PK active with IC50 = 0.034 µM and 170 fold more selective over the PI3K.