The synthesis of racemic nitrile (±)-9 was accomplished in four steps and 58% overall yield from the known pyrrolidinone 5. Nitrile (±)-9 was resolved via preparative chiral HPLC to afford optically pure nitriles (+)-9 and (−)-9, from which 3,3-dimethylprolines (+)-1 and (−)-1 and 3,3-dimethylprolinamides (+)-2 and (−)-2 could be accessed in nearly quantitative yield, without loss of optical purity
外消旋腈(±)-9的合成分四个步骤完成,已知
吡咯烷
酮5的总收率为58%。腈(±)-9通过制备型手性HPLC拆分得到光学纯的腈(+)- 9和(-)- 9,从中得到3,3-二
甲基脯
氨酸(+)- 1和(-)- 1和3,可以以几乎定量的产率获得3-二
甲基脯
氨酰胺(+)- 2和(-)- 2,而不会损失光学纯度。分辨出的脯
氨酸和脯
氨酰胺的绝对构型是通过与已知的绝对立体
化学的
中间体相关来确定的。