199800-49-2Relevant academic research and scientific papers
Catalytic Enantioselective Decarboxylative Mannich-Type Reaction of N-Unprotected Isatin-Derived Ketimines
Sawa, Masanao,Miyazaki, Shotaro,Yonesaki, Ryohei,Morimoto, Hiroyuki,Ohshima, Takashi
, p. 5393 - 5397 (2018/09/13)
The first catalytic enantioselective decarboxylative Mannich-type reaction of N-unprotected ketimines is reported, directly providing N-unprotected 3-tetrasubstituted 3-aminooxindoles in high yield and ee without protection/deprotection steps. The utility
A process for preparing AG - 041 R new method (by machine translation)
-
, (2018/09/11)
The invention discloses a method for preparing AG - 041 R of the new method, it mainly comprises the following steps: the R - 2 - (3 - amino - 2 - oxo indole - 3 - yl) acetic acid methyl ester with the 1st 1st alkaline substance is placed in the solvent, addition of amino protective agent, to obtain the intermediate V; the intermediate V, 2nd alkaline material, bromine acetaldehyde diethyl acetal is placed in 2nd solvent, stirring the reaction, to obtain the intermediate IV; the intermediate IV, methyl aniline and 3rd 3rd alkaline substance is placed in the solvent, stirring under ice bath carries out amidation reaction, to obtain the intermediate III; the intermediate III with the catalyst is placed 4th in the solvent, the reaction of the hydrogen gas, filtering to remove the catalyst, to obtain the intermediate II; the intermediate II with the toluene isocyanate is placed in the 5th solvent, stirring at room temperature the reaction, the target product. The present invention provides a process for preparing AG - 041 R of the new method, it has simple process operation, high yield, low cost, product purity and the like, and is suitable for industrial production. (by machine translation)
An asymmetric acetate-Mannich reaction of chiral isatin derived ketimines and its applications
Hajra, Saumen,Bhosale, Suhas Shivajirao,Hazra, Atanu
, p. 9217 - 9225 (2017/11/14)
A highly efficient TMSOTf-mediated asymmetric acetate-Mannich reaction of isatin derived tert-butylsulfinyl ketimines and S-phenyl thioacetate was developed to afford the direct synthesis of indole-based β3,3-amino acid thioester with excellent selectivity (dr > 98 : 2). Syntheses of (+)-AG-041R and 3-aminopyrroloindoline have been accomplished utilizing the developed method.
Resorcinarene sulfonylated cinchona alkaloid amine compd. heterointerface
-
Paragraph 0042; 0043, (2016/11/21)
PROBLEM TO BE SOLVED: To provide a heteroarenesulfonyl cinchona alkaloid amine catalyst which solves the problems about the lowness of steric selectivity/reactivity of each product even if any of many asymmetric organic molecular catalysts used for the control of asymmetric space are used.SOLUTION: The heteroarenesulfonyl cinchona alkaloid amine compound catalyst is obtained by introducing a hetroarylsulfonyl group onto the nitrogen atom of cinchona alkaloid to form an intramolecular hydrogen bond between the amide hydrogen of the sulfonamide and the hetero atom. A method for manufacturing a β-aminocarbonyl compound using the same is also provided.
Enantioselective synthesis of AG-041R by using N-heteroarenesulfonyl cinchona alkaloid amides as organocatalysts
Hara, Noriyuki,Nakamura, Shuichi,Sano, Masahide,Tamura, Ryota,Funahashi, Yasuhiro,Shibata, Norio
supporting information; experimental part, p. 9276 - 9280 (2012/08/28)
The organocatalytic enantioselective decarboxylative addition of malonic acid half thioesters to ketimines derived from isatins by using N-heteroarenesulfonyl cinchona alkaloid amides afforded products with high enantioselectivity. The products could be c
An expedient route to a potent gastrin/CCK-B receptor antagonist (+)-AG-041R
Sato, Shigeki,Shibuya, Masatoshi,Kanoh, Naoki,Iwabuchi, Yoshiharu
experimental part, p. 7522 - 7524 (2010/01/16)
(Chemical Equation Presented) An enantiocontrolled synthesis of (+)-AG-041R (1), a potent gastrin/CCK-B receptor antagonist, has been achieved employing a chiral rhodium(II)-catalyzed, oxidative intramolecular aza-spiroannulation as the key step. 2009 Ame
Highly enantioselective intramolecular aza-spiroannulation onto indoles using chiral rhodium catalysis: Asymmetric entry to the spiro-β-lactam core of chartellines
Sato, Shigeki,Shibuya, Masatoshi,Kanoh, Naoki,Iwabuchi, Yoshiharu
supporting information; experimental part, p. 6264 - 6266 (2010/02/16)
A versatile, highly enantiocontrolled entry to the spiro-β-lactam core of chartellines has been developed by expanding the scope of oxidative nitrogen atom transfer methodology based on chiral Rh-nitrenoid species.
Efficient asymmetric synthesis of novel gastrin receptor antagonist AG-041R via highly stereoselective alkylation of oxindole enolates
Emura, Takashi,Esaki, Toru,Tachibana, Kazutaka,Shimizu, Makoto
, p. 8559 - 8564 (2007/10/03)
An efficient method for asymmetric synthesis of the potent Gastrin/CCK-B receptor antagonist AG-041R was developed. Core oxindole stereochemistry was established by asymmetric alkylation of oxindole enolates with bromoacetic acid esters, using l-menthol a
