The synthesis of (3E)-1-benzyl-3-[(2-oxopyridin-1(2H)-yl)methylidene]piperidine-2,6-dione 4 from N-benzylglutarimide was achieved in three steps. The asymmetric hydrogenation of 4 gave either the product of partial reduction (10) or full reduction (13), depending on the catalyst which was employed, in high ee in each case. Attempts at asymmetric transfer hydrogenation (ATH) of 4 resulted in formation of a racemic product.
(3E)-1-苄基-3-[(2-氧
吡啶-1(2H)-基)亚甲基]
哌啶-2,6-二酮4由N-苄基戊二
酰亚胺经三步合成。4的不对称氢化反应根据所用催化剂的不同,分别得到部分还原产物(10)或完全还原产物(13),且每种情况下都具有高对映体过量。4的不对称转移氢化(ATH)尝试导致形成外消旋产物。