Identification of 2-(2′-fluoro-[1,1′-biphenyl]-2-yl)acetamide as a Sodium Valproate-like broad spectrum anti-epileptic drug candidate

By further optimizing compound A 2′-fluoro-N-methyl-1,1′-biphenyl]-2-sulfonamide], we identified DSP-0565 2-(2′-fluoro-1,1′-biphenyl]-2-yl)acetamide, 17a] as a strong, broad-spectrum anti-epileptic drug (AED) candidate. Our efforts mainly focused on finding an alternative polar group for the sulfonamide in order to improve ADME profile of compound A including good metabolic stability and no reactive metabolic production. This led to the identification of biphenyl acetamide as a new scaffold for development of broad-spectrum AED candidates. DSP-0565 showed anti-convulsant activity in various models (scPTZ, MES, 6?Hz and amygdala kindling) with good safety margin, and was therefore selected as a clinical candidate.