127199-14-8Relevant articles and documents
Novel process for synthesizing 2 -fluorocyclopropylamine with high selectivity and asymmetric synthesis
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Paragraph 0070-0072, (2021/10/13)
A novel highly selective asymmetric synthesis process of 2 -fluorocyclopropylamine (Structural I). The method provided by the invention uses 1 - fluorine -1 - benzene (propylene) sulfonyl methane and chiral epichlorohydrin to construct chiral cyclopropane under basic conditions, and a new synthetic route not only achieves a special cis-trans selectivity, but also has a highly specific stereoselectivity. The synthesis route is efficient, the reaction condition is mild, the method is suitable for large industrial production in a green environment, 2 -fluorocyclopropylamine production cost is greatly reduced.
Novel method for asymmetric synthesis of (1S,2S)-2-fluorocyclopropanecarboxylic acid under catalysis of chiral rhodium catalyst
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Paragraph 0124-0125; 0128-0130, (2019/12/02)
The invention provides a novel method for asymmetric synthesis of (1S, 2S)-2-fluorocyclopropanecarboxylic acid under catalysis of a chiral rhodium catalyst. The chiral rhodium catalyst not only can catalyze 1-fluoro-1-benzenesulfonyl ethylene and ethyl di
Stereoselective synthesis of cis -2-fluorocyclopropanecarboxylic acid
Shibue, Taku,Fukuda, Yasumichi
, p. 7226 - 7231 (2014/08/18)
A rhodium-catalyzed cyclopropanation of 1-fluoro-1-(phenylsulfonyl)ethylene and diazo esters is described as an effective method for the stereoselective synthesis of cis-2-fluorocyclopropanecarboxylic acid. This process provides an example of the cyclopro
PROCESS FOR PRODUCING 1,2-CIS-2-FLUOROCYCLOPROPANE-1-CARBOXYLIC ESTER COMPOUND
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Page/Page column 10, (2008/06/13)
Provided is an industrially applicable process for producing 1,2-cis-2-fluorocyclopropane-1-carboxylic ester. A process for producing a compound represented by formula (3): [wherein R 1 represents, for example, a C1-C8 alkyl group], which process includes reacting a compound represented by formula (1) : [wherein X 1 represents a hydrogen atom, a chlorine atom, a bromine atom, or an iodine atom; X 2 represents a hydrogen atom, a chlorine atom, a bromine atom, or an iodine atom; X 1 and X 2 are not simultaneously hydrogen atoms; and R 1 has the same meaning as defined in formula (3)] with a reducing agent represented by formula (2): €?€?€?€?€?€?€?€?M 1 BH m R 2 n (2-1) or M 2 (BH m R 2 n ) 2 €?€?€?€?€?(2-2) [wherein M 1 represents an alkali metal atom; M 2 represents an alkaline earth metal atom or a zinc atom; R 2 represents, for example, a hydrogen atom; m represents an integer from 1 to 4; n represents an integer from 0 to 3; and the sum of m and n is 4] in the presence of an aprotic polar solvent, and a Lewis acid such as a halide of an atom selected from among, for example, boron, magnesium, and aluminum.
PROCESS FOR REDUCTIVE DEHALOGENATION
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Page/Page column 6, (2008/06/13)
A method ofproducing2-fluorocyclopropane-1-carboxylic acid ester, which comprise by allowing a compound represented by the following formula (1): wherein X represents a chlorine atom, a bromine atom or an iodine atom; and R1 represents an alkyl
Purification, properties and reactivity of the esterase from Micrococcus sp.
Imura, Akihiro,Itoh, Motohiro,Miyadera, Akihiko
, p. 654 - 656 (2007/10/03)
The esterase from Micrococcus sp., which hydrolyzes n-propyl-2- fluorocyclopropanecarboxylate (3) enantioselectively, was highly purified by three types of chromatography. The purified enzyme was inactivated by Hg and diisopropyl fluorophosphate (DFP). It was a monomer with a molecular weight of about 35000. The enzyme exhibits esterase activity towards many aliphatic propyl esters. The enantioselectivity for substrate (3) using purified enzyme did not differ from that of crude enzyme.
Resolution of cis-2-fluorocyclopropanecarboxylic acid by a microbial enantioselective hydrolysis
Imura, Akihiro,Itoh, Motohiro,Miyadera, Akihiko
, p. 3047 - 3052 (2007/10/03)
The important key intermediate of quinolone analogue synthesis, (1S,2S)- 2-fluorocyclopropanecarboxylic acid, was prepared enantioselectively by a microbial resolution. One of the strains with the highest enzymatic specificity was selected from soil and when lyophilized cells were treated with corresponding ester, the remaining (1S,2S)-ester was obtained with high enantiomeric purity (98% e.e.).
(Fluorocyclopropyl)quinolones. 2. Synthesis and stereochemical structure- activity relationships of chiral 7-(7-amino-5-azaspiro[2.4]heptan-5-yl)-1- (2-fluorocyclopropyl)quinolone antibacterial agents
Kimura,Atarashi,Kawakami,Sato,Hayakawa
, p. 3344 - 3352 (2007/10/02)
A series of novel chiral 7-(7-amino-5-azaspiro[2.4]heptan-5-yl)-8-chloro- 1-(2-fluorocyclopropyl)-quinolones were synthesized as a continuation of a research project of 1-(2-fluorocyclopropyl)-quinolones by considering stereochemical and physicochemical properties of the molecule. Absolute configurations of the 1-(cis-2-fluorocyclopropyl) moiety and the 7-(7-amino- 5-azaspiro-[2.4]heptan-5-yl) moiety were determined by X-ray crystallographic analysis. Stereochemical structure-activity relationship studies indicated that 1-[(1R,2S)-2-fluorocyclopropyl] and 7-[(7S)-amino-5-azaspiro[2.4]heptan- 5-yl] derivatives are more potent against Gram-positive and Gram-negative bacteria than the other stereoisomers and 7-[(7S)-7-amino-5-azaspiro[2.4]- heptan-5-yl]-8-chloro-1-[(1R,2S)-2-fluorocyclopropyl]quinolone (33) is the most potent of all stereoisomers. Pharmacokinetic profiles and physicochemical properties of the selected compounds were also examined, and it was found that 33 (DU-6859a) possesses moderate lipophilicity and good pharmacokinetic profiles.
Fluorinated cyclopropanecarboxylic acids and their derivatives
Gassen,Baasner
, p. 127 - 139 (2007/10/02)
The addition of halofluorocarbenes such as :CF2, :CClF or :CBrF, generated from the appropriate halofluoromethanes with bases, to butadiene or isoprene gives the corresponding l-vinyl substituted halofluorocyclopropanes in moderate to good yield. The vinyl group facilitates the carbene addition and permits a subsequent wide derivatisation. Several transformations including hydroboration, oxidation and Curtius degradation are presented. Furthermore, replacement of the chlorine atom in 2-chloro-2-fluorocyclopropanecarboxylic acid derivatives by hydrogen is achieved catalytically with Raney nickel. This sequence provides a convenient route to mono-fluorine substituted cyclopropane carboxylic acids.