Dicyclohexylcarbodiimide → tert-butyl-N-methyl-N-(1-{[6-(2-phenylethynyl)-4-(pyridin-4-yl)pyridin-2-yl]-carbamoyl}ethyl)carbamate

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A mixture of 2-[methyl-[(2-methylpropan-2-yl)oxycarbonyl]amino]propanoic acid (1.44 g, 7.1 mmol) and N,N′-dicyclohexylcarbodiimide (0.73 g, 3.55 mmol) in DCM (4 ml) is stirred for 30 minutes at RT. This mixture is added in 4 portions over 48 h via syringe filter to a mixture of 6-(2-phenylethynyl)-4-(pyridin-4-yl)pyridin-2-amine G1 (0.24 g, 0.89 mmol), DIPEA (166 μl, 0.98 mmol) and NMP (2 ml) at 50° C. After stirring for another 16 h at 50° C. the mixture is filtered and the product purified by RP HPLC. Yield: 56 mg (14%). HPLC-MS: M+H=457; tR=.2.08 min (METHOD—2).

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