630392-83-5Relevant articles and documents
Indolylglycines Backbones in the Synthesis of Enantiopure 3,3-Spiroindolenines, Indolyl Tetracyclic Hemiaminals, and 3-Indolyl-maleimides Frameworks
Markus, Jozef,Ferko, Branislav,Berke?, Du?an,Moncol, Ján,Lawson, Ata Martin,Othman, Mohamed,Da?ch, Adam
, p. 5662 - 5677 (2019/08/08)
This paper describes the synthesis of novel N-substituted 3-indolylglycines (3IGs), in high yields and optical purity via three-component Mannich reaction (3CR) of indole and free glyoxylic acid in the presence of primary and secondary aliphatic amines. By using this efficient approach, a series of racemic 3-indolylglycines (3IGs) as well as the optically pure (S)-3-indolylglycine ((S)-3IG) in multigram synthesis using (R-1-phenylethylamine ((R)-α-PEA) as chiral pool were synthetized. In parallel investigations, 3IGs were used as the starting material for the highly stereoselective synthesis of spiroindolenines bearing three controlled contiguous stereogenic centers. Despite our expectations, the N-chloroacetyl esters of 3IGs did not provide the expected spiroindolenine derivatives but led us to the discovery of a new methodology for the preparation of 3-indolylmaleimides (3IMs); compounds known for their broad range of important biological and fluorescence activities.
Lithium chloride-assisted selective hydrolysis of methyl esters under microwave irradiation
Wu, Xiao-Ai,Ying, Ping,Liu, Jun-Yang,Shen, Heng-Shui,Chen, Yue,He, Ling
experimental part, p. 3459 - 3470 (2009/12/03)
A rapid and mild method for the selective hydrolysis of methyl ester in lithium chloride-N,N-dimethylformamide (LiCl-DMF) system under microwave irradiation has been developed. The effects of substituent, metal salt, and solvent on the reactivity and selectivity of the hydrolysis reaction have been investigated. Microwave irradiation significantly improves the reaction yield within a short time in an LiCl-DMF system. Moreover, the chiral-carbon of methyl esters retained its configuration during the reaction. Finally, the catalytic mechanism of hydrolysis by LiCl salt has also been proposed.
Scope and limitations of sodium and potassium trimethylsilanolate as reagents for conversion of esters to carboxylic acids
Lovric, Marija,Cepanec, Ivica,Litvic, Mladen,Bartolincic, Anamarija,Vinkovic, Vladimir
, p. 109 - 115 (2008/02/04)
Sodium or potassium trimethylsilanolate act as versatile and very powerful reagents for conversion of a wide variety of esters to carboxylic acids. The reactions were performed in tetrahydrofuran under mild reaction conditions with high to quantitative yields.