ABSTRACT Substrates (I) react with NaN3 to produce imidazole derivatives via dimerization of non-... more ABSTRACT Substrates (I) react with NaN3 to produce imidazole derivatives via dimerization of non-isolable 2-imino ester intermediates.
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ABSTRACT A simple, efficient and diastereoselective route to 2,3,6-trisubstituted 2,3-dihydro-4-p... more ABSTRACT A simple, efficient and diastereoselective route to 2,3,6-trisubstituted 2,3-dihydro-4-pyridones from methyl 3,5-dioxohexanoate, aryl aldehydes and ammonium acetate is described.
ABSTRACT A direct synthesis of 3-aryl-3-substituted propionic esters and amides is described star... more ABSTRACT A direct synthesis of 3-aryl-3-substituted propionic esters and amides is described starting from Meldrum's acid, dimedone or 4-hydroxycoumarin and an aldehyde.
... The unusual dichotomy 0 (5) Bogatskii, AV; Lukyanenko, N. G.; Kirichenko, TI Khim. (6) For N ... more ... The unusual dichotomy 0 (5) Bogatskii, AV; Lukyanenko, N. G.; Kirichenko, TI Khim. (6) For N - versus S-alkylation of substituted thioureas see: Coppola, Geterotsikl. Soedin. 1983,123-737. ... (21) Andrew, ER Philos. Tmw. Soc. (London) 1981, AM , 505. (22) Mehrina. ...
ABSTRACT 1D and 2D nmr spectroscopy was used to assign the structure to the minor product from cy... more ABSTRACT 1D and 2D nmr spectroscopy was used to assign the structure to the minor product from cyclocondensation of 4-(2-hydroxyphenyl)but-3-en-2-one with cyanamide, which was identified as (6R*, 9R*, 15R*, 17R*)-6,9-dimethyl-6,17:9,15-dimemano-6H,15H,17H-[1,3,5]benzoxadiazocino[4,5-d][1,3,5]benzoxadiazocine-7(9H)-carbonitrile, a doubly oxygen-bridged pyrimido[1,2-a]pyrimidine derivative. The observed stereose lectivity and reaction mechanisms are discussed with the help of molecular mechanics and semi-empirical PM3 calculations.
ABSTRACT Condensations of 5-(2-hydroxyphenyl)pyrazoline 3a with 4-carboxybenzaldehyde, glyoxylic ... more ABSTRACT Condensations of 5-(2-hydroxyphenyl)pyrazoline 3a with 4-carboxybenzaldehyde, glyoxylic acid and N,N-carbonyldiimidazole leading to pyrazolobenzoxazine derivatives were studied. The observed diastere-oselectivity is discussed. Reaction of 3a with Lawesson reagent gave rise to a new 5H-pyrazolo[1,5-c]-[1,3,2]benzoxazaphosphorine heterocyclic system.
ABSTRACT Cyclocondensation of 4-(2-hydroxyphenyl)-3-buten-2-one (1) with o-aminothiophenol yields... more ABSTRACT Cyclocondensation of 4-(2-hydroxyphenyl)-3-buten-2-one (1) with o-aminothiophenol yields 10-methyl-11-oxa-2-thia-9-azatetracyclo[8.7.1.03,8.012,17]octadeca-3,5,7,12,14,16-hexane (2). Similar reaction with o-phenylenediamine affords the 11-oxa-2,9-diaza analogue 3. The 2-hydroxyphenylbutenone 1 and 2-hydroxychalcone (5) show a different bridging ability.
ABSTRACT Substrates (I) react with NaN3 to produce imidazole derivatives via dimerization of non-... more ABSTRACT Substrates (I) react with NaN3 to produce imidazole derivatives via dimerization of non-isolable 2-imino ester intermediates.
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ABSTRACT A simple, efficient and diastereoselective route to 2,3,6-trisubstituted 2,3-dihydro-4-p... more ABSTRACT A simple, efficient and diastereoselective route to 2,3,6-trisubstituted 2,3-dihydro-4-pyridones from methyl 3,5-dioxohexanoate, aryl aldehydes and ammonium acetate is described.
ABSTRACT A direct synthesis of 3-aryl-3-substituted propionic esters and amides is described star... more ABSTRACT A direct synthesis of 3-aryl-3-substituted propionic esters and amides is described starting from Meldrum's acid, dimedone or 4-hydroxycoumarin and an aldehyde.
... The unusual dichotomy 0 (5) Bogatskii, AV; Lukyanenko, N. G.; Kirichenko, TI Khim. (6) For N ... more ... The unusual dichotomy 0 (5) Bogatskii, AV; Lukyanenko, N. G.; Kirichenko, TI Khim. (6) For N - versus S-alkylation of substituted thioureas see: Coppola, Geterotsikl. Soedin. 1983,123-737. ... (21) Andrew, ER Philos. Tmw. Soc. (London) 1981, AM , 505. (22) Mehrina. ...
ABSTRACT 1D and 2D nmr spectroscopy was used to assign the structure to the minor product from cy... more ABSTRACT 1D and 2D nmr spectroscopy was used to assign the structure to the minor product from cyclocondensation of 4-(2-hydroxyphenyl)but-3-en-2-one with cyanamide, which was identified as (6R*, 9R*, 15R*, 17R*)-6,9-dimethyl-6,17:9,15-dimemano-6H,15H,17H-[1,3,5]benzoxadiazocino[4,5-d][1,3,5]benzoxadiazocine-7(9H)-carbonitrile, a doubly oxygen-bridged pyrimido[1,2-a]pyrimidine derivative. The observed stereose lectivity and reaction mechanisms are discussed with the help of molecular mechanics and semi-empirical PM3 calculations.
ABSTRACT Condensations of 5-(2-hydroxyphenyl)pyrazoline 3a with 4-carboxybenzaldehyde, glyoxylic ... more ABSTRACT Condensations of 5-(2-hydroxyphenyl)pyrazoline 3a with 4-carboxybenzaldehyde, glyoxylic acid and N,N-carbonyldiimidazole leading to pyrazolobenzoxazine derivatives were studied. The observed diastere-oselectivity is discussed. Reaction of 3a with Lawesson reagent gave rise to a new 5H-pyrazolo[1,5-c]-[1,3,2]benzoxazaphosphorine heterocyclic system.
ABSTRACT Cyclocondensation of 4-(2-hydroxyphenyl)-3-buten-2-one (1) with o-aminothiophenol yields... more ABSTRACT Cyclocondensation of 4-(2-hydroxyphenyl)-3-buten-2-one (1) with o-aminothiophenol yields 10-methyl-11-oxa-2-thia-9-azatetracyclo[8.7.1.03,8.012,17]octadeca-3,5,7,12,14,16-hexane (2). Similar reaction with o-phenylenediamine affords the 11-oxa-2,9-diaza analogue 3. The 2-hydroxyphenylbutenone 1 and 2-hydroxychalcone (5) show a different bridging ability.
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