反应详情

164 mg of 6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid (Example 16A, 0.47 mmol, 1 equivalent) were dissolved in 1.4 ml of DMF, 145 mg of benzyl [(2S)-3-aminobutan-2-yl]carbamate (Example 141A, 0.65 mmol, 1.4 equivalents), 230 mg of O-(7-azabenzotriazol-1-yl)-N,N,N′N′-tetramethyluronium hexafluorophosphate (HATU, 0.6 mmol, 1.3 equivalents) and 180.7 mg of N,N-diisopropylethylamine (0.23 ml, 1.4 mmol, 3 equivalents) were added and the mixture was stirred at RT overnight. A drop of water was then added and the precipitated solid was filtered off and dried under reduced pressure. This gave 160 mg (53% of theory; purity 86%) of the title compound as colourless crystals.

1. filtrationthe precipitated solid was filtered off
2. customdried under reduced pressure