2-Thiophen-2-yl-ethanesulfonic acid [6-chloro-5-(4-chloro-phenyl)-pyrimidin-4-yl]-amide (930 mg) was added to a solution of K-tert. butylate (1.16 g) in ethylene glycol (10 ml). The mixture was stirred at 110° C. for 12 h before it was diluted with water (150 ml), acidified with 10% aq. citric acid (13 ml). The resulting precipitate was collected, washed with water and diethyl ether and dried to give (820 mg) 2-thiophen-2-yl-ethanesulfonic acid [5-(4-chloro-phenyl)-6-(2-hydroxy-ethoxy) -pyrimidin-4-yl]-amide as a beige powder. LC-MS: tR=4.43 min, [M+1]+=440.01, [M−1]−=437.99.
