Stereoselective synthesis of trans-2,6-diaryl-4-piperidones has been carried out by cycloaddition of benzaldiminetricarbonylchromium derivatives 1 with 2-silyloxybuta-1,3-diene in the presence of trimethylsilyl triflate as a Lewis acid. The tricarbonylchromium moiety played an important role in increasing the stereoselectivities of the products.
在三甲基
硅烷基三late 作为
路易斯酸存在的情况下,通过
苯甲醛基羰基
铬衍
生物 1 与 2-
硅氧基丁-1,3-二烯的环加成,实现了反式-2,6-二芳基-
4-哌啶酮的立体选择性合成。三羰基
铬分子在提高产物的立体选择性方面发挥了重要作用。