Synthesis of new liquid-crystalline compounds from the 3-aryl-5-alkylpyrazole series
摘要:
A method was developed for the preparation of new liquid-crystalline substances, pyrazole derivatives, through the corresponding 2-isoxazolines and isoxazoles. The hydrogenolysis of the heterocycle in 3-(4-hydroxyphenyl)-5-amylisoxazole afforded 1-amino- 1-(4-hydroxyphenyl)-1-octen-3-one. The acid hydrolysis of the compound followed by treating with hydrazine hydrate resulted in 5-amyl-3-(4-hydroxyphenyl)-1H-pyrazole, whose benzylation and esterification with the corresponding mesogenous benzyl chlorides and benzoyl chlorides provided liquid-crystalline 5-alkyl-3-aryl-1H-pyrazoles.
Synthesis of liquid-crystalline substances from the 5-alkyl-5-arylisoxazole series
摘要:
The oxidation of 3-(4-acetoxyphenyl)-5-pentyl-2-isoxazoline with N-bromosuccinimide followed by hydrolysis of the oxidation product furnished 3-(4-hydroxyphenyl)-5-pentyl-isoxazole. Its esterification or benzylation afforded the target liquid-crystalline 3-aryl-5-pentyl-isoxazoles.
6-NITRO-2,3-DIHYDROIMIDAZO[2,1-b]OXAZOLES AND A PROCESS FOR THE PREPARATION THEREOF
申请人:COUNCIL OF SCIENTIFIC & INDUSTRIAL RESEARCH
公开号:US20160244462A1
公开(公告)日:2016-08-25
The present invention relates to newer generation of triazoles, tetrazoles, isoxazoles, urea and sulphonamide functionalities containing 6-nitro-2, 3-dihydronitroimidazooxazoles agents of formula 1, their method of preparation, and their use as drugs for treating
Mycobacterium tuberculosis
, MDR-TB and XDR-TB either alone or in combination with other anti-tubercular agents. In the present invention, new generation 6-nitro-2, 3-dihydronitroimidazooxazoles agents also show acceptable pharmacokinetic properties and synergistic or additive effects with known anti-tubercular drugs.
Synthesis of liquid-crystalline substances from the 5-alkyl-5-arylisoxazole series
作者:V. N. Kovganko、N. N. Kovganko
DOI:10.1134/s1070428002120151
日期:2006.2
The oxidation of 3-(4-acetoxyphenyl)-5-pentyl-2-isoxazoline with N-bromosuccinimide followed by hydrolysis of the oxidation product furnished 3-(4-hydroxyphenyl)-5-pentyl-isoxazole. Its esterification or benzylation afforded the target liquid-crystalline 3-aryl-5-pentyl-isoxazoles.
Synthesis of new liquid-crystalline compounds from the 3-aryl-5-alkylpyrazole series
作者:V. N. Kovganko、N. N. Kovganko
DOI:10.1134/s1070428006050083
日期:2006.5
A method was developed for the preparation of new liquid-crystalline substances, pyrazole derivatives, through the corresponding 2-isoxazolines and isoxazoles. The hydrogenolysis of the heterocycle in 3-(4-hydroxyphenyl)-5-amylisoxazole afforded 1-amino- 1-(4-hydroxyphenyl)-1-octen-3-one. The acid hydrolysis of the compound followed by treating with hydrazine hydrate resulted in 5-amyl-3-(4-hydroxyphenyl)-1H-pyrazole, whose benzylation and esterification with the corresponding mesogenous benzyl chlorides and benzoyl chlorides provided liquid-crystalline 5-alkyl-3-aryl-1H-pyrazoles.