having an atropisomerism-like structure were prepared from ortho-substituted aniline derivatives and (S)-5-(methoxymethyl)butyrolactone in a stereoselective manner. The reactions of Li-enolates from these lactams with various electrophiles and subsequent dearylation of the products gave 3, 5-cis-disubstituted-2-pyrrolidinone derivatives.
具有阻转异构性的N-(邻
叔丁基苯基)-5-(甲氧基甲基)-
2-吡咯烷酮和N-(邻叔丁基二苯基甲
硅烷氧基苯基)-5-(甲氧基甲基)-的光学纯形式(> / = 98%ee)由邻位取代的
苯胺衍
生物和(S)-5-(甲氧基甲基)丁内酯以立体选择性的方式制备具有类似对映异构结构的
2-吡咯烷酮。这些内酰胺中的
锂烯醇盐与各种亲电试剂反应,然后产物进行脱芳基反应,得到3,5-顺-二取代-
2-吡咯烷酮衍
生物。