ChemInform Abstract: Acetals and Vinyl Ethers of Unsaturated Aldehydes and Ketones in New Synthesis of Heterocyclic Compounds. Part 5. Formation of Substituted Furo(3,4-b)tropylium Salts from 3,4-Diacetylhexan-2,5-dione, Orthoesters and Aromatic Aldehydes

ChemInform ◽  
2010 ◽  
Vol 28 (17) ◽  
pp. no-no
Author(s):  
E. P. OLEKHNOVICH ◽  
S. L. BOROSHKO ◽  
G. S. BORODKIN ◽  
I. V. KOROBKA ◽  
V. I. MINKIN ◽  
...  
Keyword(s):  
Heterocyclic Compounds ◽  
Aromatic Aldehydes ◽  
Vinyl Ethers ◽  
Unsaturated Aldehydes ◽  
New Synthesis ◽  
Aldehydes And Ketones ◽  
Tropylium Salts

AN ULTRASOUND MEDIATED GREEN SYNTHESIS OF 2-PYRAZOLINE DERIVATIVES

2021 ◽  
pp. 36-39
Author(s):  
Shrivastava Birendra ◽  
Upasna Upasna ◽  
Arora Satish Chander
Keyword(s):  
Acetic Acid ◽  
Green Synthesis ◽  
19Th Century ◽  
Heterocyclic Compounds ◽  
Unsaturated Aldehydes ◽  
Aldehydes And Ketones ◽  
The 19Th Century

Pyrazolines are prominent nitrogen-containing heterocyclic compounds and therefore, various procedures have been worked out for their synthesis. After the pioneering work of Fischer and Knoevenagel in the 19th century, the reaction of α, β-unsaturated aldehydes and ketones with phenylhydrazine in acetic acid by reuxing became one of the most popular methods for the preparation of 2-pyrazolines. Aseries of substituted 2- pyrazolines was synthesized by ultrasound irradiated method to nd out cleaner/ greener approaches.

Decarboxylative Umpolung Synthesis of Amines from Carbonyl Compounds

Synlett ◽  
2020 ◽  
Vol 31 (16) ◽  
pp. 1543-1550
Author(s):  
Baoguo Zhao ◽  
Wen-Wen Chen
Keyword(s):  
Carbonyl Compounds ◽  
Aromatic Aldehydes ◽  
High Reactivity ◽  
Mild Conditions ◽  
Intramolecular Reaction ◽  
Unsaturated Aldehydes ◽  
Recent Advances ◽  
Intermolecular Reaction ◽  
Aldehydes And Ketones

2-Azaallyl anions are valuable intermediates which have versatile applications in functionalization with various electrophiles. Decarboxylation of the imines formed from aromatic aldehydes and α,α-diphenylglycine provides an interesting and efficient way to generate delocalized 2-azaallyl anions, which display high reactivity toward different electrophiles with excellent regioselectivity at the diphenylketimino aryl carbon of the 2-azaallyl anions. The transformation produces various amines in good yields under very mild conditions. This Synpacts article highlights the recent advances on the decarboxylative umpolung synthesis of amines from carbonyl compounds.1 Introduction2 Decarboxylative Umpolung Reactions of Carbonyl Compounds with Different Electrophiles2.1 Reaction with π-Allyl–Pd(II) Species2.2 Reaction with Morita–Baylis–Hillman Adducts2.3 Reaction with Imines2.3.1 Intermolecular Reaction with N-Ts Imines2.3.2 Intramolecular Reaction with Chiral N-tert-Butanesulfinyl Imines2.4 Reaction with Aldehydes and Ketones3 Decarboxylative Umpolung Reaction of α,β-Unsaturated Aldehydes with Aldehydes4 Conclusion

Sign in / Sign up

Export Citation Format

Share Document