Carbonic acid (R)-3-[5-acetyl-3-(4-trifluoromethyl-phenyl)-4,5,6,7-tetrahydro-pyrazolo[4,3-c]pyridin-1-yl]-2-hydroxy-propyl ester tert-butyl ester 在
原乙酸三甲酯 、 camphor-10-sulfonic acid 、
4-甲基苯磺酸吡啶 作用下,
以
甲醇 为溶剂,
生成
1-[1-(R)-1-Oxiranylmethyl-3-(4-trifluoromethyl-phenyl)-1,4,6,7-tetrahydro-pyrazolo[4,3-c]pyridin-5-yl]-ethanone