167073-07-6Relevant 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 0135-0136; 0139-0140, (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
Racemic recovery method of by-product in resolution mother liquor of intermediate of sitafloxacin
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Paragraph 0040; 0041, (2019/01/07)
The invention discloses a racemic recovery method of the by-product in a resolution mother liquor of an intermediate of sitafloxacin. The method specifically comprises following steps: (1) carrying out resolution on a raceme 2-fluorocyclopropanecarboxylic
Novel 2-fluorocyclopropane carboxylic acid synthesis method
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Paragraph 0079; 0080, (2017/08/27)
The invention discloses a novel 2-fluorocyclopropane carboxylic acid synthesis method. The novel 2-fluorocyclopropane carboxylic acid synthesis method comprises the following steps: 1) enabling 1,1-dichloro-1-fluoroethane and thiophenol to react under the action of alkali to produce a phenyl sulfide intermediate; 2) implementing an oxidizing reaction between the phenyl sulfide intermediate and Oxone; 3) implementing an elimination reaction on an obtained product under the action of alkali to obtain 1-fluorine-1-phenylsulfonyl ethane; 4) implementing an addition reaction on the 1-fluorine-1-phenylsulfonyl ethane and ethyl diazoacetate under the action of a catalyst to obtain a cyclopropane intermediate; 5) implementing an elimination reaction on the cyclopropane intermediate under the action of alkali, and then acidifying to obtain 2-fluorocyclopropane carboxylic acid. The synthetic route is short, the materials are bulk commodities, cheap and easy to get, the Oxone replaces a commonly used mCPBA agent, the process is safely amplified, the reaction yield is increased, the production cost is greatly lowered, and the operation is simple.
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
Process for producing cyclopropanecarboxylates
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, (2008/06/13)
There is disclosed a process process for producing a cyclopropanecarboxylate of formula (1): 1which process comprises reacting cyclopropanecarboxylic acid of formula (2): 2with a monohydroxy compound of formula (3): R6OH??(3),in the presence of a catalyst compound comprising an element of to Group 4 of the Periodic Table of Elements.
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.).