Enantiospecific synthesis of γ-keto-α,β-diamino acid derivatives. Stereoselective synthesis of a precursor of streptolidine lactam
作者:Eduardo Fernández-Megía、F. Javier Sardina
DOI:10.1016/s0040-4039(96)02389-1
日期:1997.1
The reaction of dimethyl (4S,5S)-1-benzyl-2-oxo-3-(9″-phenylfluoren-9″-yl)-imidazolidine-4,5-dicarboxylate (3) with several organolithium reagents afforded the corresponding enantiomerically pure monoketones (4a-e) in good to excellent yields. Chloromethyl-ketone 4b was ultimately transformed into ureido-amide 8 which incorporates the bicyclic core of streptolidine lactam (1), a component of the streptrothricin
二甲基(4S,5S)-1-苄基-2-氧代-3-(9″-苯基芴-9″-基)-咪唑烷-4,5-二羧酸酯(3)与几种有机锂试剂的反应得到相应的对映体纯的单酮(4a-e),收率好至极好。最终,将氯甲基酮4b转化为脲基酰胺8,它掺入了链霉菌素抗生素的一个组成部分链霉菌内酰胺(1)的双环核心。