2-甲基呋喃 、
1,1-dichloro-4-methylpentan-2-one 在
lithium perchlorate 、
三乙胺 作用下,
以
乙醚 为溶剂,
生成 (2S,4R,5S)-4-chloro-1-methyl-2-propan-2-yl-8-oxabicyclo[3.2.1]oct-6-en-3-one 、
(2R,4S,5S)-2-chloro-1-methyl-4-propan-2-yl-8-oxabicyclo[3.2.1]oct-6-en-3-one 、 (2R,4S,5R)-2-chloro-1-methyl-4-propan-2-yl-8-oxabicyclo[3.2.1]oct-6-en-3-one