4-溴-2-氯苯甲腈 、
(4R,5S)-5-ethyl-3,3-difluoro-4-hydroxypyrrolidin-2-one 、
4,5-双二苯基膦-9,9-二甲基氧杂蒽 、
Dicaesio carbonate 在
(1E,4E)-1,5-diphenylpenta-1,4-dien-3-one;palladium 作用下,
以in the same manner as in Example 62, the title compound was obtained as pale-yellow crystals (yield: 153 mg, 10%)的产率得到2-chloro-4-[(4R,5S)-5-ethyl-3,3-difluoro-4-hydroxy-2-oxopyrrolidin-1-yl]benzonitrile