- Asymmetric synthesis of chiral cyclic amine from cyclic imine by bacterial whole-cell catalyst of enantioselective imine reductase
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Streptomyces sp. GF3587 and 3546 were found to be imine-reducing strains with high R- and S-selectivity by screening using 2-methyl-1-pyrroline (2-MPN). Their whole-cell catalysts produced 91 mM R-2-methylpyrrolidine (R-2-MP) with 99.2%e.e. and 27.5 mM S-2-MP (92.3%e.e.) from 2-MPN at 91-92% conversion in the presence of glucose, respectively.
- Mitsukura, Koichi,Suzuki, Mai,Tada, Kazuhiro,Yoshida, Toyokazu,Nagasawa, Toru
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Read Online
- Production method of (R)-2-methylpyrrolidine hydrochloride
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The invention provides a production method of (R)-2-methylpyrrolidine hydrochloride. The method is an industrial production method and adopts a reduction method of sodium borohydride and different solvents to obtain the (R)-2-methylpyrrolidine hydrochloride with the product purity of 98% or above and the product total yield of 70% or above. Also provided is a process for the synthesis of chiral (R)-2-methylpyrrolidine hydrochloride. Meanwhile, raw materials adopted in the method are easy to obtain, synthesis conditions are simple, the product yield is high, and the method is suitable for industrial production.
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Paragraph 0017-0021
(2021/01/24)
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- MODULATORS OF THE HISTAMINE H3-RECEPTOR USEFUL FOR THE TREATMENT OF DISORDERS RELATED THERETO
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The present invention relates to certain biphenyl sulfonamide derivatives of Formula (Ia) and pharmaceutical compositions thereof that modulate the activity of the histamine H3-receptor. Compounds and pharmaceutical compositions thereof are directed to methods useful in the treatment of histamine H3-receptor associated disorders, such as, cognitive disorders, epilepsy, brain trauma, depression, obesity, disorders of sleep and wakefulness such as narcolepsy, hypersomnia, somnolence syndrome, jet lag, sleep apnea and the like, attention deficit hyperactivity disorder (ADHD), schizophrenia, allergies, allergic responses in the upper airway, allergic rhinitis, nasal congestion, dementia, Alzheimer's disease and the like.
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Page/Page column 80
(2008/06/13)
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- An efficient and convergent synthesis of the potent and selective H3 antagonist ABT-239
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An efficient and convergent process for the preparation of a potent and selective H3 receptor antagonist, ABT-239, 1A was accomplished with an overall yield of 64%. The key step in the synthesis is a Sonogashira coupling/cyclization reaction of 1-but-3-ynyl-2-(R)-methylpyrrolidine (9) with 4′-hydroxy-3′-iodo-biphenyl-4-carbonitrile (3). Additionally, the key amine component 2-(R)-methylpyrrolidine (7) was effectively synthesized from the readily available Boc-l-prolinol with a simple catalytical hydrogenolysis as the key step. This column chromatography-free process is highlighted by several simple work-up and purification procedures and is amendable to the large-scale preparation of 1A.
- Ku, Yi-Yin,Pu, Yu-Ming,Grieme, Tim,Sharma, Padam,Bhatia, Ashok V.,Cowart, Marlon
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p. 4584 - 4589
(2007/10/03)
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- OXAZOLE DERIVATIVES AS HISTAMINE H3 RECEPTOR AGENTS, PREPARATION AND THERAPEUTIC USES
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The present invention discloses novel aryl oxazole compounds of Formula I (I), or pharmaceutically acceptable salts thereof, which have histamine-H3 receptor antagonist or inverse agonist activity, as well as methods for preparing and using such compounds. In another embodiment, the invention discloses pharmaceutical compositions comprising compounds of Formula I as well as methods of using these compositions to treat obesity, cognitive deficiencies, narcolepsy, and other histamine H3 receptor-related diseases. Formula I (I) or a pharmaceutically acceptable salt thereof, wherein: m is independenlly at each occurrence 1, 2, or 3, Z independently represents carbon (substituted with hydrogen or the optional substituents indicated herein) or nitrogen, provided that when Z is nitrogen then R6 is not attached to Z; R1 and R2 are independently -(C1-C7) alkyl(optionally substituted with one to three halogens), or R1 and R2 and the nitrogen to which they are attached form an azetidinyl ring, a pyrrolidinyl ring, or a piperidinyl ring, wherein further the azetidinyl, pyrrolidinyl, or piperidinyl ring so formed may be optionally substituted one to three times with R5; R6 is independently at each occurrence -H, -halogen, or -CH3.
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Page/Page column 44
(2008/06/13)
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- Process for preparing 2-methylpyrrolidine and specific enantiomers thereof
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The invention relates to a process for preparing 2-methylpyrrolidine and, more particularly, specific enantiomers of 2-methylpyrrolidine. Novel intermediates also are described.
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- Peptide derivatives having thiazolyl-alanine residue
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A peptide derivation of the formula (I) or its pharmaceutically acceptable salt or hydrate thereof is disclosed. These compounds have superior ability over thyroid stimulating hormone (TRH) and its derivatives to activate the central nervous system, such as, for example, sustained acetylcholine releasing action, anti-reserpine action and locomotor increment.
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