4-[(2-ethylpyrazolo[1,5-a]pyridin-3-yl)methyl]benzoic acid 在
potassium dihydrogenphosphate 、 (benzotriazo-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate 、
N,N-二异丙基乙胺 作用下,
以
二甲基亚砜 为溶剂,
以50%的产率得到(cis,trans)-N-(2,4-dioxo-7-oxa-1,3-diazaspiro[4.5]dec-10-yl)-4-[(2-ethylpyrazolo[1,5-a]pyridin-3-yl)-methyl]benzamide