(2S)-2-amino-2-(4-methylcyclohexyl)-N-{2-oxo-1-[2-(trimethylsilyl)ethoxymethyl]spiro[pyrrolo[3,2-c]pyridine-3,4‘-tetrahydropyran]-6-yl}acetamide hydrochloride 、
3-cyclobutylisoxazole-4-carboxylic acid 在
N,N-二异丙基乙胺 、 N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
以93 %的产率得到3-cyclobutyl-N-[(1S)-1-(4-methylcyclohexyl)-2-oxo-2-({2-oxo-1-[2-(trimethylsilyl)ethoxymethyl]spiro[pyrrolo[3,2-c]pyridine-3,4‘-tetrahydropyran]-6-yl}amino)ethyl]isoxazole-4-carboxamide