Supported copper catalysts for highly efficient hydrogenation of biomass-derived levulinic acid and γ-valerolactone

2016 ◽  
Vol 18 (5) ◽  
pp. 1287-1294 ◽  
Author(s):  
Qing Xu ◽  
Xinglong Li ◽  
Tao Pan ◽  
Chuguo Yu ◽  
Jin Deng ◽  
...  
Keyword(s):  
Levulinic Acid ◽  
Copper Catalysts ◽  
Direct Conversion ◽  
Highly Efficient ◽  
Chemoselective Hydrogenation ◽  
Supported Copper Catalysts

Direct conversion of cellulose-derived levulinic acid into γ-valerolactone and γ-valerolactone into 1,4-pentanediol was carried out by chemoselective hydrogenation catalyzed through supported copper-catalysts.

Intramolecular Diels–Alder Reactions of Oxazoles, Imidazoles, and Thiazoles

Synthesis ◽  
2020 ◽  
Author(s):  
Peter Wipf ◽  
Thanh T. Nguyen
Keyword(s):  
Natural Products ◽  
Lewis Acid ◽  
Acid Catalysis ◽  
Copper Catalysts ◽  
Diels Alder ◽  
Synthetic Approach ◽  
Highly Efficient ◽  
Intramolecular Cycloadditions ◽  
Western Segment ◽  
Target Molecules

AbstractThe development of the intramolecular Diels–Alder cycloaddition­ of azole heterocycles, i.e. oxazoles (IMDAO), imidazoles (IMDAI), and thiazoles (IMDAT), has had a significant impact on the efficient preparation of heterocyclic intermediates and natural products. In particular, highly efficient and versatile IMDAO reactions have been utilized as a key step in several synthetic schemes to provide alkaloids and terpenoid target molecules. More limited studies have been performed on IMDAI and IMDAT cycloadditions. Some drawbacks, such as the occasionally­ challenging preparation of IMDA precursors, are also highlighted in this review. Perspectives are provided on how IMDAI and IMDAT­ transformations can be further expanded for target-directed syntheses.1 Introduction2 Oxazoles2.1 IMDAO Approaches to Furanosesquiterpenes and Furanosteroids2.1.1 Syntheses of Highly Oxygenated Sesquiterpenes2.1.2 Syntheses of (±)-Gnididione and (±)-Isognididione2.1.3 Synthesis of (±)-Stemoamide2.1.4 Synthesis of (±)-Paniculide A2.1.5 Syntheses of (+)- and (–)-Norsecurinine2.1.6 Synthesis of Evodone2.1.7 Syntheses of (±)-Ligularone and (±)-Petasalbine2.1.8 Syntheses of Imerubrine, Isoimerubrine, and Grandirubrine2.1.9 Syntheses of Furanosteroids2.1.10 Syntheses of Substituted Indolines and Tetrahydroquinolines2.2 IMDAO Approaches to Pyridines: the Kondrat’eva Reaction2.2.1 Syntheses of Suaveoline and Norsuaveoline2.2.2 Synthesis of Eupolauramine2.2.3 Syntheses of (–)-Plectrodorine and (+)-Oxerine2.2.4 Synthesis of Amphimedine2.2.5 Synthetic Approach to the Western Segment of Haplophytine2.2.6 Synthesis of Marinoquinoline A2.2.6.1 IMDAO Approach to Marinoquinoline A2.2.6.2 Scope of Allenyl IMDAO Cycloaddition2.3 Lewis Acid Catalysis in IMDAO Reactions2.3.1 Effects of Europium Catalysts on IMDAO Reactions2.3.2 Effects of Copper Catalysts on IMDAO Reactions3 Imidazoles 4 Thiazoles4.1 Syntheses of Menthane and Eremophilane4.2 Further Comments on the Intramolecular Cycloadditions of Thiocarbonyl Ylides5 Conclusions and Outlook

Multicomponent Pt-based catalyst for highly efficient chemoselective hydrogenation of 4-carboxybenzaldehyde

2021 ◽  
Author(s):  
Xu Fang ◽  
Aixin Fan ◽  
Zhen Wang ◽  
Yao Wang ◽  
Yunrui Li ◽  
...  
Keyword(s):  
Highly Efficient ◽  
Chemoselective Hydrogenation

Highly efficient and practical phosphoramidite–copper catalysts for amination of aryl iodides and heteroaryl bromides with alkylamines and N(H)-heterocycles

Tetrahedron ◽  
2006 ◽  
Vol 62 (18) ◽  
pp. 4435-4443 ◽  
Author(s):  
Zhanjin Zhang ◽  
Jincheng Mao ◽  
Di Zhu ◽  
Fan Wu ◽  
Huilin Chen ◽  
...  
Keyword(s):  
Copper Catalysts ◽  
Highly Efficient ◽  
Aryl Iodides

scholarly journals Study on the Catalytic Properties of Silica Supported Copper Catalysts

2013 ◽  
Vol 51 ◽  
pp. 467-472 ◽  
Author(s):  
Manish Dixit ◽  
Manish Mishra ◽  
P.A. Joshi ◽  
D.O. Shah
Keyword(s):  
Catalytic Properties ◽  
Copper Catalysts ◽  
Supported Copper Catalysts

Direct conversion of cellulose to levulinic acid using SO3H-functionalized ionic liquids containing halogen-anions

2021 ◽  
pp. 117278
Author(s):  
Shengbin Shi ◽  
Yuanfeng Wu ◽  
Mengting Zhang ◽  
Zongqi Zhang ◽  
Olayinka Oderinde ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Levulinic Acid ◽  
Direct Conversion

Direct conversion of secondary propargyl alcohol into 1,3-di-arylpropanone via DBU promoted redox isomerization and palladium assisted chemoselective hydrogenation in a single pot operation

2021 ◽  
Author(s):  
Rimpa De ◽  
S. Antony Savarimuthu ◽  
Shubhadeep Chandra ◽  
Mrinal K Bera
Keyword(s):  
Direct Conversion ◽  
Single Step ◽  
Propargyl Alcohol ◽  
Efficient Catalyst ◽  
Chemoselective Hydrogenation ◽  
Redox Isomerization

Palladium(II)acetate is found to be an efficient catalyst for the single-step conversion of secondary propargyl alcohol to 1,3-diarylpropanone derivatives under mild basic conditions. The reaction is believed to proceed via...

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