(2S,3S)-2-amino-3-methyl-pentan-3-ol trifluoroacetate 、
2-cyclopropyl-5-((2-trimethylsilanyl)ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazin-7-carboxylic acid 以to provide 2-cyclopropyl-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid ((1S,2S)-2-hydroxy-1,2-dimethyl-butyl)-amide的产率得到2-cyclopropyl-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid ((1S,2S)-2-hydroxy-1,2-dimethyl-butyl)-amide.