Reductive coupling of aliphatic cyclic imides and ω-amidoesters with benzophenones by low-valent titanium: Synthesis of 5-diarylmethylene-1,5-dihydropyrrol-2-ones, 6-diarylmethyl-2-pyridones, and ω-(diarylmethylene)lactams
作者:Naoki Kise、Syn Kinameri、Toshihiko Sakurai
DOI:10.1016/j.tet.2019.05.013
日期:2019.6
The reductive coupling of cyclic imides and ω-amidoesters with benzophenones by Zn-TiCl4 in THF and subsequent acid-catalyzed dehydration gave 5-diarylmethylene-1,5-dihydropyrrol-2-ones A, 6-diarylmethyl-2-pyridones B, and ω-(diarylmethylene)lactams C. In a similar manner, 3-((benzyloxy)carbonyl)amino substituted A, B, and C were synthesized from the corresponding 3-((benzyloxy)carbonyl)amino cyclic
在THF中通过Zn-TiCl 4将环酰亚胺和ω-氨基酯与二苯甲酮还原偶合,然后酸催化脱水,得到5-二芳基亚甲基-1,5-二氢吡咯-2-酮A,6-二芳基甲基-2-吡啶酮B,和ω-(二芳)内酰胺ç。以类似的方式,由相应的3-((苄氧基)羰基)氨基环状酰亚胺和ω-((苄氧基)羰基)氨基-ω-合成3-((苄氧基)羰基)氨基取代的A,B和C。由L-天冬氨酸和L-谷氨酸制备的酰胺基酯。另外,4-和5-((苄氧基)羰基)氨基取代的C还通过相同的方法分别从分别由L-天冬酰胺和L-谷氨酰胺制备的2-((苄氧基)羰基)氨基-ω-酰胺基酯中获得了α-己内酰胺。