Electroreductive five- and six-membered cyclization of aromatic β- and γ-imino esters derived from (S)-aspartic acid and (S)-glutamic acid
作者:Yosei Takenaga、Yujiro Umesaki、Toshihiko Sakurai、Naoki Kise
DOI:10.1016/j.tet.2012.01.100
日期:2012.3
The electroreduction of aromatic β-dimethylcarbamoyl-β-imino esters, prepared from (S)-aspartic acid, in the presence of chlorotrimethylsilane gave five-membered cyclized products, 1-benzoyl-4-hydroxy-5-aryl-N,N-dimethylpyrrolidine-2-carboxamides and 5-(dimethylcarbamoyl)-2-aryl-1H-pyrrol-3-yl benzoates, depending on the post-treatment after the electroreduction. The electroreduction of aromatic γ
芳香族β二甲基氨基甲β亚氨基酯的电还原,由(小号) -天冬氨酸,三甲基氯硅烷在的存在下,得到五元环化产物,1-苯甲酰基-4-羟基-5-芳基- Ñ,ñ -取决于电还原后的后处理,二甲基吡咯烷-2-羧酰胺和5-(二甲基氨基甲酰基)-2-芳基-1 H-吡咯-3-基苯甲酸酯。由(S)-谷氨酸制得的芳族γ-二烷基氨基甲酰基-γ-亚氨基和γ-甲氧基甲基-γ-亚氨基酯的电还原反应,然后转化为六元环化产物1-苯甲酰基-5-羟基-N,ñ-二烷基-6-苯基哌啶-2-羧酰胺和3-羟基-6-(甲氧基甲基)-2-苯基哌啶-1-基)(苯基)甲烷酮。