Stereoselective synthesis of 3-amino-4-substituted-2-azetidinones via [2+2] cycloadditions of tricarbonyl(η6arene)chromium(0)complexed imines
作者:Paola Del Buttero、Giorgio Molteni、Antonio Papagni
DOI:10.1016/j.tetasy.2003.09.046
日期:2003.12
The stereoselective [2+2] cycloaddition reaction between the chiral tricarbonyl(η6arene) chromium(0) complexed imines 1 and 6 and phthalimidoketene affords tricarbonyl (η6arene)chromium(0) complexed 3-phthalimido-2-azetidinones 3, 7 and 8, both in racemic and enantiopure form. Decomplexation and the cleavage of the phthalimido group give 3-amino-4-substituted-2-azetidinones 5 and 10. Some insights
立体选择性[2 + 2]的手性三羰基之间的环加成反应(η 6芳烃)铬(0)复合的亚胺1和6和phthalimidoketene得到三羰基(η 6芳烃)铬(0)复合3-邻苯二甲酰-2-氮杂环丁酮3,外消旋和对映纯形式的图7和8。分解和邻苯二甲酰亚胺基团的裂解给出3-氨基-4-取代的-2-氮杂环丁酮5和10。讨论了一些见解[2 + 2]环加成过程的立体化学结果。