Synthesis of Enaminones in Aqueous Media Using Catalytic Dilute HCl
摘要:
[image omitted] A green and convenient approach to the synthesis of -enaminones from aromatic amines and 5-substituted-1,3-cyclohexanedione in the presence of dilute hydrochloric acid (30mmol/L) as a catalyst in solvent-free media is described. This method provides several advantages such as environmental friendliness, low cost, good yields, and simple workup procedure.
Domino reactions of cyclic enaminones leading to selective synthesis of pentacyclic indoles and its functionalization
作者:Wei Fan、Yan-Rong Li、Qun Li、Bo Jiang、Guigen Li
DOI:10.1016/j.tet.2016.06.058
日期:2016.8
established, providing selective protocol to pentacyclic indoles with different substituted patterns (up to 50 examples). Both substitutions on the cyclic enaminone ring and reaction temperatures showed obvious impact on the reaction pathways. For instance, selective allylic hydroxylation and allylic esterification of in situ generated indoles depend on reaction temperatures. With special substituents
An Efficient Synthesis of Pyrroline-Fused Acridine Derivatives Catalyzed by Silica Sulfuric Acid
作者:Ming-Hua Hu、Wei Lin、Cheng-Pao Cao、Zhi-Bin Huang、Da-Qing Shi
DOI:10.1002/jhet.2023
日期:2014.8
A simple and efficientsynthesis of pyrrolo[2,3,4-kl]acridine-1-one derivatives via the cascade reaction of isatins with enaminones catalyzed by silicasulfuricacid (SSA) has been established. In this reactions, SSA shows a highly catalytic nature: easy to handle procedure, short reaction time, recycle exploitation, insensitivity to air and moisture, and excellent isolated yields. The catalyst could
Microwave-Assisted Improved Synthesis of Pyrrolo[2,3,4-kl]acridine and Dihydropyrrolo[2,3,4-kl]acridine Derivatives Catalyzed by Silica Sulfuric Acid
作者:Chengpao Cao、Changliang Xu、Wei Lin、Xuemei Li、Minghua Hu、Juxian Wang、Zhibin Huang、Daqing Shi、Yucheng Wang
DOI:10.3390/molecules18021613
日期:——
An improved synthesis of multifunctionalized pyrrolo[2,3,4-kl]acridinederivatives with different substituted patterns using silicasulfuricacid (SSA) as a heterogeneous catalyst under microwave irradiation conditions was developed. The reaction could be conducted by using readily available and inexpensive substrates within short periods of 12–15 min. under microwave irradiation. Compared with the
Domino Constructions of Pentacyclic Indeno[2,1-c]quinolines and Pyrano[4,3-b]oxepines by [4+1]/[3+2+1]/[5+1] and [4+3] Multiple Cyclizations
作者:Bo Jiang、Bao-Ming Feng、Shu-Liang Wang、Shu-Jiang Tu、Guigen Li
DOI:10.1002/chem.201201109
日期:2012.8.6
New three‐component domino reactions have been discovered. The reactions are easy to perform (see scheme; MW=microwave irradiation) and proceed with fast rates, which makes work‐up convenient. Most of the multiple stereocenters and the geometry are controlled well. The stereochemistry has been unequivocally determined by X‐ray structural analysis.
发现了新的三组分多米诺骨牌反应。该反应易于进行(参见方案;MW=微波辐射)并且进行速度快,这使得后处理变得方便。大多数多个立构中心和几何形状都控制得很好。立体化学已通过 X 射线结构分析明确确定。
I2/DMSO-mediated substrate selective oxidation of tetrahydro indole-2,4-dione towards 4-hydroxy isatins and 5,6-dihydro-1H-indole-2,4-dione derivatives
indole-2,4-diones from readily available β-enaminones and glyoxal and subsequent I2/DMSO-mediated oxidation/aromatization of tetrahydro indole-2,4-dione to produce 4-hydroxyisatin derivatives. The key aspect of this protocol includes the dual catalytic activity of molecular iodine in the presence of DMSO. Mechanistic study suggested that this reaction is substrate selective as corresponding aromatization