855300-09-3Relevant academic research and scientific papers
Synthesis method of rivastigmine optical isomerization intermediate and (R)-rivastigmine
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Paragraph 0074-0076; 0083-0085; 0092-0094; 0101-0103, (2020/01/25)
The invention provides a synthesis method of a rivastigmine optical isomerization intermediate and (R)-rivastigmine. The method comprises the following steps: carrying out an asymmetric reductive amination reaction on 3-nitromethyl ethyl formate acetophen
SYNTHESIS OF NOVEL INTERMEDIATE(S) FOR PREPARING RIVASTIGMINE
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Paragraph 0077, (2020/04/10)
The present invention relates to novel intermediate(s), which are useful for the preparation of Rivastigmine compound of formula (I) and its pharmaceutically acceptable salts. The present invention further relates to the processes for the preparation of such novel intermediate(s) and preparation of Rivastigmine using such novel intermediate(s).
A method for preparing Rivastigmine citrate (by machine translation)
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Paragraph 0039-0041, (2019/10/23)
The invention discloses a method for preparing Rivastigmine citrate, said method is to meta-hydroxy acetophenone, methyl ethyl carbamic chloride as the raw material in the isotope energy level transitions, alternately high and low frequency ultrasonic and
Direct asymmetric reductive amination for the synthesis of (S)-rivastigmine
Gao, Guorui,Du, Shaozhi,Yang, Yang,Lei, Xue,Huang, Haizhou,Chang, Mingxin
supporting information, (2018/09/10)
In this article we demonstrate how asymmetric total synthesis of (S)-rivastigmine has been achieved using direct asymmetric reductive amination as the key transformation in four steps. The route started with readily available and cheap m-hydroxyacetophenone, through esterification, asymmetric reductive amination, N-diphenylmethyl deprotection and reductive amination, to provide the final (S)-rivastigmine in 82% overall yield and 96% enantioselectivity. In the asymmetric reductive amination, catalysed by the iridium–phosphoramidite ligand complex and helped by some additives, the readily prepared 3-acetylphenyl ethyl(methyl)carbamate directly reductively coupled with diphenylmethanamine to yield the chiral amine product in 96% ee and 93% yield.
A General Catalytic Method for Highly Cost- and Atom-Efficient Nucleophilic Substitutions
Huy, Peter H.,Filbrich, Isabel
supporting information, p. 7410 - 7416 (2018/04/30)
A general formamide-catalyzed protocol for the efficient transformation of alcohols into alkyl chlorides, which is promoted by substoichiometric amounts (down to 34 mol %) of inexpensive trichlorotriazine (TCT), is introduced. This is the first example of a TCT-mediated dihydroxychlorination of an OH-containing substrate (e.g., alcohols and carboxylic acids) in which all three chlorine atoms of TCT are transferred to the starting material. The consequently enhanced atom economy facilitates a significantly improved waste balance (E-factors down to 4), cost efficiency, and scalability (>50 g). Furthermore, the current procedure is distinguished by high levels of functional-group compatibility and stereoselectivity, as only weakly acidic cyanuric acid is released as exclusive byproduct. Finally, a one-pot protocol for the preparation of amines, azides, ethers, and sulfides enabled the synthesis of the drug rivastigmine with twofold SN2 inversion, which demonstrates the high practical value of the presented method.
Design, synthesis, biological evaluation, and molecular modeling studies of chalcone-rivastigmine hybrids as cholinesterase inhibitors
Wang, Ling,Wang, Yu,Tian, Yiguang,Shang, Jinling,Sun, Xiaoou,Chen, Hongzhuan,Wang, Hao,Tan, Wen
, p. 360 - 371 (2016/12/22)
A series of novel chalcone-rivastigmine hybrids were designed, synthesized, and tested in vitro for their ability to inhibit human acetylcholinesterase and butyrylcholinesterase. Most of the target compounds showed hBChE selective activity in the micro- a
A kind of carbamate-koncar ketone choline esterase inhibitor and its preparation method and application (by machine translation)
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Paragraph 0148; 0149; 0160, (2016/11/28)
The present invention discloses a kind of carbamate-koncar ketone choline esterase inhibitor and its preparation method and application, belongs to the field of medicinal chemistry. Cholinesterase inhibitors of the invention represented by general formula
Compound and its as L-type calcium channel blocker or/and application of acetylcholine esterase inhibitors
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Paragraph 0276-0277, (2016/10/07)
Disclosed in this invention are compounds and the uses as L-type calcium channel blocker and/or acetylcholinesterase inhibitor thereof. The uses of said compounds in the manufactures of a medicament for the treatment of cardiovascular diseases, apoplexy or senile dementia are also disclosed in the present invention.
Synthesis of 3-vinylphenyl ethyl(methyl)carbamate: A potential human metabolite of rivastigmine
Xu, Guanhong,Ma, Teng,Yang, Jing,Wang, Fengliang,Zhang, Hongjuan,Wang, Xiuzhen,Li, Fei
, p. 3499 - 3500 (2013/04/24)
Convenient and efficient syntheses of 3-vinylphenyl ethyl (methyl) carbamate, one of potential metabolites from rivastigmine, has been developed. The overall yield is higher than 30% and represents the first direct synthesis of this metabolite from rivast
Chemo-enzymatic synthesis of optically pure rivastigmine intermediate using alcohol dehydrogenase from baker's yeast
Sethi, Madhuresh K.,Bhandya, Somashekar R.,Kumar, Anish,Maddur, Nagaraj,Shukla, Rohit,Jayalakshmi Mittapalli
, p. 87 - 92 (2013/05/22)
An efficient and practical synthesis of (S)-rivastigmine intermediate was developed by employing a chemoenzymatic step toward the synthesis of chiral intermediate N-ethyl-N-methyl-carbamic acid-3-(1S-hydroxy-ethyl)-phenyl ester (2) using crude alcohol deh
