Synthesis of 7-hydroxy-6,7-dihydro-indole and 6′,7′-dihydro-3,7′-biindole derivatives from domino reactions of arylglyoxals or methyl ketones with enamines
作者:Xin-Mou Lu、Zhong-Jian Cai、Jian Li、Shun-Yi Wang、Shun-Jun Ji
DOI:10.1039/c5ra09478j
日期:——
successfully synthesized in moderate to good yields by the dominoreactions of different arylglyoxals 1 with enamines 2 under catalyst-free conditions. 7-Hydroxy-2-aryl-6,7-dihydro-indol-4(5H)-ones 3 could also be prepared in moderate yields by the iodine-promoted one pot-two step reactions of methyl ketones 6 with enamines 2. The reaction of 3a with N-methyl indole 7a in the presence of PTSA afforded
Enantioselective Construction of Tetrahydroquinolin-5-one-Based Spirooxindole Scaffold via an Organocatalytic Asymmetric Multicomponent [3 + 3] Cyclization
作者:Qiu-Ning Zhu、Yu-Chen Zhang、Meng-Meng Xu、Xiao-Xue Sun、Xue Yang、Feng Shi
DOI:10.1021/acs.joc.6b01598
日期:2016.9.2
e-based spirooxindole has been developed via a chiral cinchona alkaloid catalyzed asymmetric three-component [3 + 3] cyclization of cyclic enaminone, isatin, and malononitrile, which afforded a series of tetrahydroquinolin-5-one-based spirooxindoles in high yields and with excellent enantioselectivities (up to 99% yield, 97:3 er). This reaction could be applicable to large-scale synthesis of enantioenriched
Silver-catalyzed tandem nucleophilic addition/cycloisomerization of ortho-alkynylbenzaldehydes: Regioselective synthesis of functionalized 1H-isochromene derivatives
作者:Fang-Hui Li、Jian Li、Shun-Yi Wang、Shun-Jun Ji
DOI:10.1016/j.tet.2017.07.051
日期:2017.9
An efficient silver-catalyzed domino cycloisomerization reaction for regioselective assembly of 1H-isochromene derivatives from o-alkynylaryl aldehydes with enaminones as the external nuclephiles is developed. This protocol affords isochromene derivatives in moderate to good yields under simple and mild reaction conditions.
Enantioselective Construction of Cyclic Enaminone-Based 3-Substituted 3-Amino-2-oxindole Scaffolds<i>via</i>Catalytic Asymmetric Additions of Isatin-Derived Imines
作者:Lu-Jia Zhou、Yu-Chen Zhang、Fei Jiang、Guofeng He、Jingjing Yan、Han Lu、Shu Zhang、Feng Shi
DOI:10.1002/adsc.201600508
日期:2016.10.6
bioactivity has been developed via chiral phosphoric acid‐catalyzed enantioselective addition reactions of cyclic enaminones to isatin‐derived imines, which afforded a series of cyclic enaminone‐based 3‐substituted 3‐amino‐2‐oxindoles in high yields and excellent enantioselectivities (up to 99% yield, 97% ee). The investigation of the reaction mechanism suggested that it was facilitated by a dual hydrogen‐bonding
Regioselective synthesis of 6-nitroindole derivatives from enaminones and nitroaromatic compounds <i>via</i> transition metal-free C–C and C–N bond formation
Few methods are known for the synthesis of nitroindole derivatives. A simple and practical Cs2CO3-promoted method for the synthesis of 6-nitroindole derivatives from enaminones and nitroaromatic compounds has been developed. Two new C–C and C–N bonds were formed in a highly regioselective manner under transition metal-free conditions.
已知很少有合成硝基吲哚衍生物的方法。开发了一种简单实用的Cs 2 CO 3促进的烯胺酮和硝基芳族化合物合成6-硝基吲哚衍生物的方法。在无过渡金属条件下,两个新的 C-C 和 C-N 键以高度区域选择性的方式形成。