394-01-4Relevant articles and documents
Preparation method of 2-amino-4-fluorobenzoic acid
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Paragraph 0030-0032; 0035; 0037; 0040; 0042; 0045; 0047; ..., (2021/08/28)
The invention relates to a preparation method of 2-amino-4-fluorobenzoic acid, which comprises the following steps: by taking cheap and easily available 4-fluorobenzyl alcohol as a raw material, firstly carrying out nitration reaction to obtain a nitro substitute, then carrying out oxidation reaction on the nitro substitute to obtain benzoic acid oxide, and finally carrying out reduction reaction on the benzoic acid oxide to finally obtain 2-amino-4-fluorobenzoic acid which is high in purity and high in yield. The preparation method disclosed by the invention has the characteristics of cheap and easily available raw materials, short reaction route, conventional reaction, mild reaction conditions, high yield and easiness in industrial production.
Condensed pyrazole derivatives, process for producing the same and use thereof
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, (2008/06/13)
Novel pharmaceutical compositions for inhibiting Th2-selective immune response and pharmaceutical compositions for inhibiting cyclooxygenase comprising condensed pyrazole derivatives represented by the general formula (I): or salts thereof.
FLUORINATED TRICYCLIC NEUROLEPTICS WITH PROLONGED ACTION: 7-FLUORO-11--2-ISOPROPYL-10,11-DIHYDRODIBENZOTHIEPIN
Protiva, Miroslav,Jilek, Jiri,Rajsner, Miroslav,Pomykacek, Josef,Ryska, Miroslav,et al.
, p. 698 - 722 (2007/10/02)
Substitution reaction of 11-chloro-7-fluoro-2-isopropyl-10,11-dihydrodibenzothiepin with 1-(2-hydroxyethyl)piperazine gave the title compound I which proved a very potent and long acting oral neuroleptic agent ("isofloxythepin").Its resolution by means of dibenzoyl-(+)- and (-)-tartaric acid led to (-)- and (+)-enantiomer out of which the former represents the neuroleptically active component.In the synthetic sequence leading to I, preparation of two key intermediates was re-elaborated using new partial sequences: 4-fluoro-2-iodobenzoic acid (XIII) from 4-fluoro-2-nitroaniline (V) via the nitrile VI and the acids VIII and XII, and acetic acid (XVIII) from XIII via XIV and the compounds XV-XVII.The sulfoxides and N-oxides XIX-XXII were prepared as potential metabolites of isofloxithepin (I).