4-azaspiro[2.5]octan-7-ol hydrochloride 、 5-[(tert-butoxy)carbonyl]-4H,5H,6H,7H-pyrazolo[1,5-a]pyrazine-3-carboxylic acid 在
三乙胺 、 N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate 作用下,
以
乙腈 为溶剂,
反应 0.17h,
以17.3%的产率得到tert-butyl 3-{7-hydroxy-4-azaspiro[2.5]octane-4-carbonyl}-4H,5H,6H,7H-pyrazolo[1,5-a]pyrazine-5-carboxylate