Asymmetric synthesis of α-amino acids from α,β-(Z)-didehydroamino acid derivatives with 1,2,3,6-tetrahydropyrazin-2-one structure
作者:Tomás Abellán、Balbino Mancheño、Carmen Nájera、José M Sansano
DOI:10.1016/s0040-4020(01)00553-1
日期:2001.7
structure 10 by condensation with carbonyl compounds, Eschenmoser's salt and Bredereck's reagent, respectively. The didehydroalanine derivative 15 and the enaminone 16 can give DDAA derivatives 14 using Heck olefination and vinylic nucleophilic substitution. These DDAA derivatives 14 and 15 undergo diastereoselective cyclopropanation, 1,3-dipolar and Diels–Alder cycloaddition reactions giving, after
手性(Ž)-α,β-didehydroamino酸(DDAA)衍生物14,15和16是从所获得的新的手性iminic环状甘氨酸模板与1,2,3,6- tetrahydropyrazin -2-酮结构10通过与羰基缩合化合物,Eschenmoser盐和Bredereck试剂。使用Heck烯化和乙烯基亲核取代,二氢丙氨酸衍生物15和烯胺酮16可以得到DDAA衍生物14。这些DDAA衍生物14和15 进行非对映选择性环丙烷化,1,3-偶极和Diels-Alder环加成反应,水解后得到相应的环状和双环α-氨基酸。