2,3-Dichloro-5,6-dicyano-1,4-benzoquinone (DDQ)-Mediated C(<i>sp</i>
<sup>2</sup>
)-C(<i>sp</i>
<sup>3</sup>
) Cross-Dehydrogenative Coupling Reaction: α-Alkylation of Push-Pull Enamines and α-Oxo Ketene Dithioacetals
作者:Dongping Cheng、Lijun Wu、Zhiteng Deng、Xiaoliang Xu、Jizhong Yan
DOI:10.1002/adsc.201700853
日期:2017.12.19
A novel, metal‐free cross‐dehydrogenativecoupling (CDC) reaction of C(sp2)–H bonds of enamines and α‐oxo ketene dithioacetals with C(sp3)–H bonds of 1,3‐diarylpropenes mediated by 2,3‐dichloro‐5,6‐dicyano‐1,4‐benzoquinone (DDQ) is reported. The α‐alkylation products are obtained with moderate to good yields. The method provides an efficient and alternative strategy for the synthesis of the corresponding
Sulfuric acid catalyzed addition of β-dicarbonyl compounds to alcohols under conventional heating and microwave-assisted conditions
作者:Fei Xia、Zheng Le Zhao、Pei Nian Liu
DOI:10.1016/j.tetlet.2012.03.104
日期:2012.6
The highlyefficient direct addition of β-dicarbonylcompounds to secondaryalcohols has been achieved using one of the cheapest acids, H2SO4, as the catalyst. For a series of β-dicarbonylcompounds and various secondaryalcohols, the addition reactions all complete in 5 min with high yields both under the conventional heating condition and under the microwave heating condition. The comparison of the
使用最便宜的酸之一H 2 SO 4作为催化剂,已经实现了将β-二羰基化合物高效直接加成到仲醇中。对于一系列β-二羰基化合物和各种仲醇,在常规加热条件下和微波加热条件下,加成反应均在5分钟内完成,且收率很高。从微波加热条件获得的结果与从常规加热条件获得的结果的比较表明,在微波辅助的加成反应中不存在明显的特定或非热微波效应。
Solvent-Free Alkylation of 1,3-Dicarbonyl Compounds with Benzylic, Propargylic and Allylic Alcohols Catalyzed by La(NO3)3·6H2O
作者:Madala Subramanyam、Koya Prabhakara Rao、Ravi Varala、Mandava V. Basaveswara Rao
DOI:10.14233/ajchem.2016.19621
日期:——
An efficient and solvent free method for benzylation, propargylation and allylation of 1,3-dicarbonyl compounds with alcohols has been developed by using La(NO3)3·6H2O as water tolerable catalyst. The reaction was shown to proceed smoothly for various 1,3-dicarbonyl compounds with benzylic, propargylic and allylic alcohols including 10 allylic alcohols, without any solvent, providing a clean access to the desired products in short reaction times with good to excellent yields and high selectivity.
Triflic acid adsorbed on silica gel as an efficient and recyclable catalyst for the addition of β-dicarbonyl compounds to alcohols and alkenes
作者:Pei Nian Liu、Fei Xia、Qing Wei Wang、Yu Jie Ren、Jun Qin Chen
DOI:10.1039/b926142g
日期:——
The silicagel supported triflic acid was readily prepared via simple absorption of TfOH onto chromatographic silicagel. This solid acid was applied as an efficient catalyst for the heterogeneous addition of various β-dicarbonyl compounds to a series of alcohols and alkenes, which afforded moderate to excellent yields under solvent-free conditions or in nitromethane. Moreover, this silicagel supported