1-(2',4'-dimethylpent-3'-yloxy)-3-methyl-1-trimethylsilyloxybuta-1,3-diene 、 (R)-2-Chloro-3-phenylselanyl-tetrahydro-pyran 在
zinc dibromide 作用下,
生成
(E)-3-Methyl-4-((2S,3R)-3-phenylselanyl-tetrahydro-pyran-2-yl)-but-2-enoic acid 1-isopropyl-2-methyl-propyl ester 、 3-Methyl-2-((2S,3R)-3-phenylselanyl-tetrahydro-pyran-2-yl)-but-3-enoic acid 1-isopropyl-2-methyl-propyl ester