RESUMEN

A new methodology to obtain C-25 and C-26 steroidal acids starting from pregnenolone is described. Construction of the side chain was achieved by applying the Mukaiyama aldol reaction with a non-hydrolytic work-up to isolate the trapped silyl enol ether with higher yields. Using this methodology we synthesized three new steroidal acids as potential ligands of DAF-12, Liver X and Glucocorticoid nuclear receptors and studied their activity in reporter gene assays. Our results show that replacement of the 21-CH3 by a 20-keto group in the side chains of the cholestane scaffold of DAF-12 or Liver X receptors ligands causes the loss of the activity.

Asunto(s)

Receptores X del Hígado/metabolismo , Receptores Citoplasmáticos y Nucleares/metabolismo , Receptores de Glucocorticoides/metabolismo , Esteroides/síntesis química , Colestenos/síntesis química , Colestenos/química , Hidrólisis , Espectroscopía de Resonancia Magnética , Estructura Molecular , Esteroides/química