Scheme 2From: Targeting apoptosis; design, synthesis and biological evaluation of new benzoxazole and thiazole based derivativesSynthesis of 4-substituted-3-nitrobenzoic acid (6a−h), Reagents and conditions: a NaNO3, H2SO4, 0 °C then rt, 24 h, 90% b K2CO3, DMF, rt, 8–24 h, 55–65%Back to article page