Stereoselectivity in reactions of amino acids catalyzed by pyridoxal derivatives carrying rigidly-Attached chirally-Mounted basic groups—transamination, racemization, decarboxylation, retro-Aldol reaction, and aldol condensation

2002 ◽  
Vol 10 (12) ◽  
pp. 3973-3979 ◽  
Author(s):  
Lei Liu ◽  
Mary Rozenman ◽  
Ronald Breslow
Keyword(s):  
Amino Acids ◽  
Aldol Condensation ◽  
Aldol Reaction

An efficient click synthesis of chalcones derivatized with two 1-(2-quinolon-4-yl)-1,2,3-triazoles

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mohammed B. Alshammari ◽  
Ashraf A. Aly ◽  
Alan B. Brown ◽  
Md Afroz Bakht ◽  
Ahmed M. Shawky ◽  
...  
Keyword(s):  
Aldol Condensation ◽  
Aldol Reaction ◽  
Click Synthesis

Abstract Chalcones derivatized with 1-(2-quinolonyl)-1,2,3-triazoles were synthesized by reaction of 4-azido-2-quinolones with 1-phenyl-3-(4-propargyloxyphenyl)prop-2-en-1-one, or by aldol reaction of 4-{[1-(2-oxo-1,2-dihydroquinolin-4-yl)-1H-1,2,3-triazol-4-yl]methoxy}benzaldehydes with acetophenone. Whereas, chalcones bearing two 1-(2-quinolonyl)-1,2,3-triazoles were synthesized by reaction of 1,3-bis(4-propargyloxyphenyl)prop-2-en-1-one with 4-azido-2-quinolones, or by aldol condensation between 4-{4-[(4-acetylphenoxy)methyl]-1H-1,2,3-triazol-1-yl}quinolin-2(1H)-ones and 4-{[1-(2-oxo-1,2-dihydroquinolin-4-yl)-1H-1,2,3-triazol-4-yl]methoxy}benzaldehydes.

Nanosheet-Enhanced Asymmetric Induction of Chiral α-Amino Acids in Catalytic Aldol Reaction

2012 ◽  
Vol 18 (48) ◽  
pp. 15323-15329 ◽  
Author(s):  
Li-Wei Zhao ◽  
Hui-Min Shi ◽  
Jiu-Zhao Wang ◽  
Jing He
Keyword(s):  
Amino Acids ◽  
Aldol Reaction ◽  
Asymmetric Induction

The Aldol Condensation of Acetaldehyde: the Equilibrium Constant for the Reaction and the Rate Constant for the Hydroxide Catalyzed RetroAldol Reaction

1974 ◽  
Vol 52 (11) ◽  
pp. 2037-2040 ◽  
Author(s):  
J. Peter Guthrie
Keyword(s):  
Equilibrium Constant ◽  
Rate Constant ◽  
Aldol Condensation ◽  
Aldol Reaction ◽  
Enthalpy Change

An indirect thermochemical estimate of the equilibrium constant for the aldol condensation of acetaldehyde suggested that this reaction was much less irreversible than has been believed. The rate of the hydroxide catalyzed retroaldol reaction has been measured; k21 = 2.8 × 10−3 M−1 s−1 at 25°, so that the equilibrium constant is 4.0 × 102 M−1. The γ value for acetaldehyde as addend is 0.40. The enthalpy change for the aldol reaction is −9.84 kcal/mol.

Selective Michael−Aldol Reaction by Use of Sterically Hindered Aluminum Aryloxides as Lewis Acids:  An Easy Approach to Cyclobutane Amino Acids

2005 ◽  
Vol 7 (16) ◽  
pp. 3597-3600 ◽  
Author(s):  
Alberto Avenoza ◽  
Jesús H. Busto ◽  
Noelia Canal ◽  
Jesús M. Peregrina ◽  
Marta Pérez-Fernández
Keyword(s):  
Amino Acids ◽  
Lewis Acids ◽  
Aldol Reaction ◽  
Sterically Hindered

Direct Synthesis of β-Hydroxy-α-amino Acids via Diastereoselective Decarboxylative Aldol Reaction

2013 ◽  
Vol 15 (22) ◽  
pp. 5770-5773 ◽  
Author(s):  
Yuttapong Singjunla ◽  
Jérôme Baudoux ◽  
Jacques Rouden
Keyword(s):  
Amino Acids ◽  
Direct Synthesis ◽  
Aldol Reaction

The Effectiveness of Proteinogenic Amino Acids in the Asymmetric Aldol Reaction in DMSO and Aqueous DMSO

Synlett ◽  
2008 ◽  
Vol 2008 (10) ◽  
pp. 1565-1570 ◽  
Author(s):  
Yujiro Hayashi ◽  
Takahiko Itoh ◽  
Norio Nagae ◽  
Masahiro Ohkubo ◽  
Hayato Ishikawa
Keyword(s):  
Amino Acids ◽  
Aldol Reaction ◽  
Asymmetric Aldol ◽  
Aqueous Dmso ◽  
Asymmetric Aldol Reaction
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