Diisopropylamine → N-({4-[({6-[(cyclopropylmethyl)(propyl)amino]pyrimidin-4-yl}carbonyl)amino]-3-methylphenyl}sulfonyl)glycine

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A solution of methyl 2-(4-(6-chloropyrimidine-4-carboxamido)-3-methylphenylsulfonamido)acetate (Intermediate 33, 123 mg; 0.31 mmol) and diisopropylamine (105.5 mL; 0.61 mmol) in ethanol (4 ml) was treated with N-(cyclopropylmethyl)propan-1-amine (45.3 mg; 0.4 mmol). The mixture was heated to 160° C. in a microwave for 1 hour and the solvent removed in vacuo. The residue was purified by column chromatography (silica) eluting with petroleum ether containing increasing amounts of EtOAc to give a mixture of methyl 2-(4-(6-((cyclopropylmethyl)(propyl)amino)pyrimidine-4-carboxamido)-3-methylphenylsulfonamido)acetate and ethyl 2-(4-(6-((cyclopropylmethyl)(propyl)amino)pyrimidine-4-carboxamido)-3-methylphenylsulfonamido)acetate which was used directly without any further purification. The residue was redissolved in methanol (10 ml) and tetrahydrofuran (10 ml) and treated with 5 N NaOH solution (1 ml). After stirring at RT for 5 hours the solvent was removed in vacuo. The residue was redissolved in water (10 ml) and acidified with conc. HCl. The aqueous phase was extracted with EtOAc and the organic extracts passed through a hydrophobic frit and the solvent removed in vacuo. The residue was triturated with petroleum ether to yield the title compound as a white solid.

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