PIDA-Mediated Oxidative C−C Bond Formation: Novel Synthesis of Indoles from <i>N</i>-Aryl Enamines
作者:Wenquan Yu、Yunfei Du、Kang Zhao
DOI:10.1021/ol900576a
日期:2009.6.4
A variety of functionalized indoles were synthesized from N-arylenaminesvia PIDA-mediated oxidative carbon−carbon bond formation. The features of the present reaction include facilitative preparation of substrates 2, good functional group tolerance, and mild reaction conditions without transition metals.
arylboronic acids and ester (Z)-3-aminoacrylates, one-pot syntheses of diverse indole-3-carboxylic esters have been described through copper(II)-catalyzed sequential Chan–Lam N-arylation and cross-dehydrogenativecoupling (CDC) reactions. The initial Chan–Lam arylation can proceed in DMF at 100 °C for 24 h to give ester (Z)-3-(arylamino)acrylate intermediates in the presence of Cu(OAc)2/tri-tert-butylphosphine
从芳基硼酸和酯 ( Z )-3-氨基丙烯酸酯开始,通过铜 ( II ) 催化的顺序 Chan-Lam N-芳基化和交叉脱氢偶联 (CDC )描述了多种吲哚-3-羧酸酯的一锅合成。) 反应。最初的 Chan-Lam 芳基化可以在 DMF 中在 100 °C 下进行 24 小时,在 Cu(OAc) 2 /三叔丁基膦四氟硼酸催化剂存在下得到酯 ( Z )-3-(芳氨基)丙烯酸酯中间体。作为添加剂的肉豆蔻酸、KMnO 4和KHCO 3的量。依次,这些就地芳基化中间体可以在混合溶剂(DMF/DMSO = 2:1)中在 130 °C 下进行分子内氧化交叉脱氢偶联过程,得到 C3 官能化多取代吲哚衍生物。
Synthesis of Diversely Substituted Indoloquinolinones via Pd(II)/Cu(II)-Mediated Oxidative C–C Bond Formation and I(III)-Mediated C–N Bond Formation
one-pot sequence of N-alkylation, saponification and methoxyamidation, and final intramolecular oxidative C–N bond formation. The underpinning of the strategy entails Pd(OAc)2/Cu(OAc)2-mediated oxidative C(sp2)–C(sp2) bond formation and I(III)-mediated oxidative C(sp2)–N bond formation.