Photoredox-catalyzed synthesis of α-alkylated unnatural amino acid derivatives with glyoxylimines and 4-alkyl-1,4-dihydropyridines
作者:Yongling Wang、Tiexin Zhang、Xinyu Hao、Kun Jin、Rong Zhang、Xuming Zhang、Hanyang Sun、Jinyao Leng、Chunying Duan、Yaming Li
DOI:10.1016/j.tet.2023.133490
日期:2023.7
visible-light-mediated radical alkylation of glyoxylimines with 4-alkyl-1,4-dihydropyridines as radical precursors has been developed. Iridium complex was selected as photocatalyst and also, Brønsted acid especially PhCOOH evidently improved the reactivity. A variety of α-alkylated unnatural amino acid derivatives could be produced in good yields. In addition, the straightforward and efficient one-pot procotol, involved
已经开发了以 4-烷基-1,4-二氢吡啶作为自由基前体的可见光介导的乙醛亚胺自由基烷基化反应。选择铱络合物作为光催化剂,同时,Brønsted 酸尤其是 PhCOOH 明显提高了反应活性。可以以良好的收率生产多种α -烷基化的非天然氨基酸衍生物。此外,直接高效的一锅法协议涉及乙二酸乙酯、伯胺和 4-烷基-1,4-二氢吡啶的多组分反应,顺利进行,从而能够轻松获得非天然氨基酸衍生物。