Process for preparing diketopyrrolopyrrole derivatives

摘要

This disclosure relates to a process for preparing bis(hydroxymethyl)pyrrolopyrrole compounds of the formula <IMAGE> (II) wherein A1 and A2 are aryl radicals, by reacting a 1,4-diketopyrrolopyrrole with formaldehyde. The compound of formula (II) can be isolated or further reacted in a one pot synthesis to yield a compound of the formula <IMAGE> (I) wherein B1 and B2 are organic radicals.