(2R,5S,2'R/S)-5-allyl-2,5-dihydro-2-isopropyl-3,6-dimethoxy-5-(2-hydroxy-3-butenyl)pyrazine 在
Grubbs catalyst first generation 作用下,
以
1,2-二氯乙烷 为溶剂,
反应 48.0h,
以72%的产率得到(2R,5S,3'R/S)-2,5-dihydro-2-isopropyl-3,6-dimethoxypyrazine-5-spiro(4'-cyclohexen-3'-ol)