Ethyl 2-(tert-butoxy)-2-[4-(4,4-dimethylcyclohex-1-en-1-yl)-2-methyl-5-(5-chloro-4-methyl-isothiazol-3-yl)thiophen-3-yl]acetate 、
四甲基乙二胺 、 Sodium tetraborohydride 、 cyclohexane, ethyl acetate 在
(1,1'-bis(diphenylphosphino)ferrocene)palladium(II) dichloride 氩 、
水 、
乙酸乙酯 、
Sodium sulfate-III 作用下,
以
四氢呋喃 为溶剂,
反应 16.0h,
以to give 2-(tert-butoxy)-2-{2-methyl-4-[4,4-dimethylcyclohex-1-en-1-yl]-5-(4-methyl isothiazol-3-yl)thiophen-3-yl}acetic acid (example 89) (20 mg, 0.046 mmol, 11%, atropisomers mixture) as a brown solid after two purifications by preparative TLC (dichloromethane/methanol 90/10)的产率得到2-Tert-butoxy-2-[4-(4,4-dimethylcyclohexen-1-yl)-2-methyl-5-(4-methylisothiazol-3-yl)-3-thienyl]acetic acid