作者:Stefania Capone、Annalisa Guaragna、Giovanni Palumbo、Silvana Pedatella
DOI:10.1016/j.tet.2005.04.046
日期:2005.7
An asymmetric synthesis of anti-2,3-diamino acids is reported. The enolates of N,N-dibenzylated β3-amino esters were treated with di-tert-butyl azodicarboxylate (DBAD) to afford their N′,N″-di-Boc-2-hydrazino derivatives with excellent anti diastereoisomeric ratio. Final Boc removal and reductive cleavage of the hydrazino bond led to the expected 2,3-diamino esters having only one free amino group
报道了抗-2,3-二氨基酸的不对称合成。的烯醇化物Ñ,Ñ -dibenzylatedβ 3 -氨基酯用二-处理叔丁基偶氮二羧酸酯(DBAD),得到其Ñ ',Ñ “ -二叔丁氧羰基-2-肼基具有优良的衍生物反非对映异构比例。最终的Boc去除和肼基键的还原性裂解导致预期的仅具有一个游离氨基的2,3-二氨基酯。与其他不对称C-2胺化程序相比,该方法不需要使用昂贵的手性试剂和/或手性助剂,同时可以得到可以正交保护的产物。