64471-47-2Relevant academic research and scientific papers
Preparation method of levo-demethyl benzene ring nonyl ester hydrochloride
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Paragraph 0067-0069, (2020/09/09)
The invention belongs to the technical field of medicine preparation, and discloses a preparation method of levo-demethylated benzene ring nonyl ester hydrochloride, the molecular formula of the levo-demethylated benzene ring nonyl ester hydrochloride is shown as (1), the method comprises the following steps: (1) preparing (R)-alpha-phenyl-alpha-cyclopentyl-alpha-methyl glycolate; (2) preparing anintermediate, wherein the intermediate is N-benzyl-3-azabicyclo-[3.3. 1]-non-9 [alpha]-alcohol; and (3) carrying out transesterification on the (R)-alpha-phenyl-alpha-cyclopentyl-alpha-methyl glycolate and N-benzyl-3-azabicyclo-[3.3. 1]-non-9 alpha-ol, removing benzyl on N through catalytic hydrogenation to obtain a crude product of L-demethyl benzene ring nonyl ester, salifying, and recrystallizing to obtain the L-hydrochloric acid demethyl benzene ring nonyl ester. The method is environmentally friendly and suitable for large-scale production.
Discovery of a Novel Muscarinic Receptor PET Radioligand with Rapid Kinetics in the Monkey Brain
Malmquist, Jonas,Varn?s, Katarina,Svedberg, Marie,Vallée, Frédéric,Albert, Jeffrey S.,Finnema, Sjoerd J.,Schou, Magnus
, p. 224 - 229 (2018/03/01)
Positron emission tomography (PET), together with a suitable radioligand, is one of the more prominent methods for measuring changes in synaptic neurotransmitter concentrations in vivo. The radioligand of choice for such measurements on the cholinergic sy
Stereoselective synthesis of the optical isomers of a new muscarinic receptor antagonist, HL-031120
Liu, Yu-Min,Liu, He,Zhong, Bo-Hua,Liu, Ke-Liang
, p. 1815 - 1822 (2007/10/03)
We present here a practical stereoselective synthetic method to produce enantiopure isomers of a new muscarinic receptor antagonist, HL-031120 (3-quinuclidinyl-2′-cyclopentyl-2′-hydroxy-2′-phenylacetate, I). Four optical isomers were effectively by stereoselective synthesized using pivaldehyde as steric hindrance agent from the chiral starting material, ( S ) or ( R )-mandelic acid. The isomers were obtained with 70-76% yields in 98-99% e.e. Copyright Taylor & Francis Group, LLC.
Optical resolution, stereoselective synthesis, and crystal structure of 9α-(3-azabicyclo[3,3,1]nonanyl)-2′cyclopentyl-2′-hydroxy- 2′-phenylacetate
Liu, Yan-Qing,Liu, He,Zhong, Bo-Hua,Deng, Yu-Lin,Liu, Ke-Liang
, p. 1403 - 1412 (2007/10/03)
9α-(3-Azabicyclo[3,3,1 ]nonanyl)-2′-cyclopentyl-2′- hydroxy-2′-phenylacetate (1) was synthesized and its enantiomers were obtained by the optical resolution of racemates with the chiral host N-p-toluenesulfonylglutamic acid. Optical pure 1 was also effect
