New strategies for the synthesis of heteroannulated 2-pyridinones, substituted 2-quinolinones and coumarins from dehydroamino acid derivatives
作者:Maria João R.P. Queiroz、Ana S. Abreu、Ricardo C. Calhelha、M. Solange D. Carvalho、Paula M.T. Ferreira
DOI:10.1016/j.tet.2008.03.057
日期:2008.5
was developed for the synthesis of 2-quinolinones and coumarins. Thus, β-brominated dehydroamino acids were reacted with 2-(pinacolboronate)aniline or phenol in a one-pot Suzuki coupling followed by lactamization or lactonization to give the corresponding 3-amino-2-quinolinones or 3-aminocoumarins in good to high yields. This type of strategy was also applied to the synthesis of 2-quinolinones and
由N - Boc -β,β-二杂芳基脱氢丙氨酸的甲酯经乙酸处理制备了几种杂环吡啶酮。后者通过β,β-二溴代脱氢丙氨酸与杂芳基硼酸酯化合物的双-Suzuki偶联而获得。以高收率获得产物,并且环化反应涉及Boc基团的羰基上杂芳环之一的亲核攻击。该反应的范围扩展至N的Z-异构体-Boc-β-杂芳基脱氢苯基丙氨酸产生4-苯基吡啶酮。开发了串联的铃木偶联-环化方案以合成2-喹啉酮和香豆素。因此,将β-溴化的脱氢氨基酸与2-(频哪醇硼酸酯)苯胺或苯酚以一锅Suzuki偶联反应,然后进行内酰胺化或内酯化,以良好或高收率得到相应的3-氨基-2-喹啉酮或3-氨基香豆素。 。这种类型的策略也适用于合成3-氨基酸的2-喹啉酮和香豆素,使用溴化脱氢肽作为起始原料。