(-)-(R)-S-2-[N-(2-Hydroxy-1,1-dimethylethyl)-aminocarbonylthio]-2-phenyl-3-pentanone 在
三氟化硼乙醚 作用下,
以
乙醚 为溶剂,
反应 120.0h,
生成 (5S,6R)-5-ethyl-2,2,6-trimethyl-6-phenyl-1-aza-4-oxa-7-thiabicyclo[3.3.0]octan-8-one 、 (5R,6R)-5-ethyl-2,2,6-trimethyl-6-phenyl-1-aza-4-oxa-7-thiabicyclo[3.3.0]octan-8-one