Unexpected and Divergent Reactions of N-Formyl-1,2-dihydroquinolines with Sodium Azide: Highly Chemoselective Formation of 2-Substituted Quinolines and Isoxazolo[4,3-c]quinolines
作者:Weike Su、Jingbo Yu、Zhenhua Li、Bei Zheng
DOI:10.1055/s-0029-1219800
日期:2010.5
Efficient and divergent synthesis of 2-substituted quinolines and isoxazolo[4,3-c]quinolines was achieved from N-formyl-1,2-dihydroquinolines with the aid of sodium azide. The synthesis is substituent-dependent. Thus N-formyl-1,2-dihydroquinolines with a hydrogen atom at the 3-position afforded 2-substituted quinolines in good to excellent yields, while with a 3-formyl group, N-formyl-1,2-dihydroquinolines unexpectedly gave isoxazolo[4,3-c]quinolines in high yields.
在叠氮化钠的帮助下,以 N-甲酰基-1,2-二氢喹啉为原料,实现了 2-取代喹啉和异噁唑并[4,3-c]喹啉的高效和发散合成。合成过程与取代基有关。因此,在 3 位含有一个氢原子的 N-甲酰基-1,2-二氢喹啉能以良好到极好的收率得到 2-取代的喹啉,而含有 3-甲酰基的 N-甲酰基-1,2-二氢喹啉则意外地以高收率得到异恶唑并[4,3-c]喹啉。