Base‐Promoted Synthesis of Polysubstituted 4‐Aminoquinolines from Ynones and 2‐Aminobenzonitriles under Transition‐Metal‐Free Conditions
摘要:
AbstractA transition‐metal‐free and base‐promoted one‐pot reaction of ynones with 2‐aminobenzonitriles is described. The reaction was initiated through sequential aza‐Michael addition/intramolecular annulation to afford various multisubstituted 4‐aminoquinolines and 4‐amino‐1,8‐naphthyridines in good to excellent yields. Operational simplicity, high atom‐economy with broad substrate scope makes this protocol more attractive. Also, the gram‐scale synthesis and further transformation of the product were studied. Additionally, 2‐haloarylyones as substrate provide N‐arylquinolones as the sole product via the SNAr mechanism.magnified image
C(CO)–C(Ar) bond cleavage of β-enaminones has been realized under mild and transition-metal-free conditions. The cascade transformation based on this C–C bond cleavage involves 1,3-O/C migration and aerobic hydroxylation and leads to various 5-hydroxy-1H-pyrrol-2(5H)-ones with broad functional group tolerance. The application of this methodology has been showcased by preparing 5-alkoxy-1H-pyrrol-2(5H)-one
在温和且无过渡金属的条件下,实现了前所未有的β-烯胺酮的C(CO)-C(Ar)键裂解。基于这种C–C键断裂的级联转化涉及1,3-O / C迁移和需氧羟基化,并导致各种具有广泛官能团耐受性的5-羟基-1 H-吡咯-2(5 H)-酮。通过制备5-烷氧基-1 H-吡咯-2(5 H)-one衍生物和吡咯并[ 2,1- a ]异喹啉-3-酮衍生物展示了该方法的应用。
A Phosphine-Mediated Synthesis of 1,4-Oxazepine- and 1,5-Oxazocine-Based Sugar Hybrids from Deoxysugar Azides¹
An efficient and convenient method was developed for the synthesis of novel 1,4-oxazepine- and 1,5-oxazocine-based sugar hybrids from readily available deoxysugar azides by means of tributylphosphine-mediated tandem reactions. The resulting glycoconjugates might be useful in increasing the diversity of sugar backbones, and could find applications as potential glycomimetics and in drug discovery.
Base-mediated ynone-isocyanide [3+2] cycloaddition: a general method to 2,3,4-tri-substituted 1-<i>H</i>-pyrroles and bis-pyrroles
作者:Ankit Kumar、Pawan K. Mishra、Akhilesh K. Verma
DOI:10.1039/d3cc01586f
日期:——
A general method for the synthesis of functionalized pyrroles and bis-pyrroles from ynones under transition-metal-free conditions in good to excellent yields has been developed.
Palladium-Catalyzed Difluorocarbene Transfer Enabled Divergent Synthesis of γ-Butenolides and Ynones from Iodobenzene and Terminal Alkynes
作者:Heyun Sheng、Zhiwei Chen、Qiuling Song
DOI:10.1021/jacs.3c13044
日期:2024.1.17
Herein, we report a ligand-controlled palladium-catalyzed method that enables the synthesis of ynones and γ-butenolides with excellent regioselectivity from the same set of readily available aryl iodides, aryl acetylenes, and BrCF2CO2K. In this reaction, the [PdII]═CF2 does demonstrate electrophilicity and can generate CO readily when reacting with H2O. It is environmentally friendly and safe compared
在此,我们报道了一种配体控制的钯催化方法,该方法能够从同一组容易获得的芳基碘化物、芳基乙炔和 BrCF 2 CO 2 K 合成具有优异区域选择性的炔酮和 γ-丁烯内酯。在该反应中, [Pd II ]=CF 2确实表现出亲电性,与 H 2 O 反应时很容易生成 CO。与传统方法相比,它对环境友好且安全,并且当前的方案使我们能够以高产率提供炔酮和 γ-丁烯内酯出色的功能容差。此外,利用该策略还可以与相应的酚和醇获得酯。生物活性化合物后期功能化的成功进一步说明了该方案在材料开发和药物发现中的合成效用。
Synthesis and tuberculostatic activity of S-acylvinyl-N, N-dialkyldithiocarbamates and 2-(diethylimmonium)-4-acylmethyl-4-phenyl-1, 3-dithietane perchlorates
作者:V. N. Elokhina、A. S. Nakhmanovich、A. E. Aleksandrova、B. I. Bishnevskii、I. D. Kalikhman