摘要:

Abstract1‐Phenyl‐3,4‐dichloromaleimide, 1‐n‐propyl‐3‐bromomaleimide, and 2,3‐dichloro‐1,4‐naphthoquinone have been condensed with various mono‐ and bis‐nucleophiles to yield a range of novel dyes and pigments. Their visible absorptio

ISSN:0022-152X    

DOI:10.1002/jhet.5570260401

出版商:Wiley‐Blackwell    

年代:1989

数据来源: WILEY

摘要:

AbstractLes pKa1et pKa2de 19 bihétérocycles de formule générate A‐(CH2)n‐B (où A et B représentent un pyrazole, un imidazole ou une pyridine, et n = 0 ou 1) sont déterminés dans l'eau à 25° par potentiométrie et par sp

ISSN:0022-152X    

DOI:10.1002/jhet.5570260402

出版商:Wiley‐Blackwell    

年代:1989

数据来源: WILEY

摘要:

AbstractSince we developed [1] a synthetic entry to 3,4,4a,5‐tetrahydro[1,2,4]triazino[6,1‐c][1,4]benzoxazines1, we decided to explore the chemistry of this novel ring system. Its behaviour towards manganese dioxide is here descri

ISSN:0022-152X    

DOI:10.1002/jhet.5570260403

出版商:Wiley‐Blackwell    

年代:1989

数据来源: WILEY

摘要:

AbstractThe title compounds3were prepared in low yields from the carbylamine reaction of amino‐1,3,5‐triazines1under phase‐transfer conditions. Isocyanotriazine3areadily reacted with amines in the presence of copper salts to afford triazinylformamidines4, and also with active methylene compounds in the presence of base to afford addition products5and6, indicating the high electrophilicity of3.The reactions of isocyanotriazine with electrophiles such as carbonyl compounds and bromine are also desc

ISSN:0022-152X    

DOI:10.1002/jhet.5570260404

出版商:Wiley‐Blackwell    

年代:1989

数据来源: WILEY

摘要:

AbstractSynthesis and1H‐,13C‐nmr analysis of some substituted 3‐phenyl‐1,2,3,4‐tetrahydroisoquinolines are reported. Spectroscopy assignments of hydrogen and carbon resonances were made on the basis of standard chemical shift theory, comparison with reference compounds, attached proton test and fully coupled13C‐nmr spectra. Data showed that at room temperature two conformers predominated for the 1,3‐disubstituted and 1,2,3‐trisubstitute

ISSN:0022-152X    

DOI:10.1002/jhet.5570260405

出版商:Wiley‐Blackwell    

年代:1989

数据来源: WILEY

摘要:

AbstractA convenient route is reported for the synthesis of seven new pyrimidine derivatives namely: 2‐bromometh‐yl‐4,6‐dimethoxypyrimidine (3), 2‐dibromomethyl‐4,6‐dimethoxypyrimidine (4), 2‐acetoxymethyl‐4,6‐dimeth‐oxypyrimidine (5), 2‐hydroxymethyl‐4,6‐dimethoxypyrimidine (6), 4,6‐dimethoxypyrimidine‐2‐carboxaldehyde (7), 2‐acetoxymethyl‐6‐methoxy‐3,4‐dihydropyrimidin‐4‐one (8) and 2‐hydrox

ISSN:0022-152X    

DOI:10.1002/jhet.5570260406

出版商:Wiley‐Blackwell    

年代:1989

数据来源: WILEY

摘要:

AbstractA number of methylfuro[3,2‐g]quinolin‐7(8H)‐ones, which can be considered isosters of methylpsoralens, were synthesized. The synthesis was performed starting from the appropriate methyl quinolin‐2‐ones on which the methylfuran ring was condensed. The molar absorptivity at long wavelengths of these compounds is remarkably higher than that of the corresponding methylpsoralen isosters; this fact may lead to an improved photo‐binding to the biologi

ISSN:0022-152X    

DOI:10.1002/jhet.5570260407

出版商:Wiley‐Blackwell    

年代:1989

数据来源: WILEY

摘要:

AbstractSynthesis of 2,2,4‐trisubstituted‐1,2‐dihydroquinazolines6from readily available 2‐aminobenzonitrile (1) is described. The scope and limitations of the method are di

ISSN:0022-152X    

DOI:10.1002/jhet.5570260408

出版商:Wiley‐Blackwell    

年代:1989

数据来源: WILEY

摘要:

AbstractNew quinoline‐2,6‐dicarboxylic acid and 6‐aminoquinoline‐2‐carboxylic acid which are potential monomers for the introduction of quinoline units in commercial polymers such as polyamides, polyesters, etc. have been sy

ISSN:0022-152X    

DOI:10.1002/jhet.5570260409

出版商:Wiley‐Blackwell    

年代:1989

数据来源: WILEY

摘要:

AbstractPyrido[3,4‐d]pyridazines2–5, 21bearing one, two, or three aryl substituents in the pyridine moiety are shown to be conveniently accessible from 4‐aroyl‐5‐methylpyridazines or 4,5‐diaroylpyridazines, respectively, by condensation reactions with appropriate C‐N fragments. In addition, the novel pyridazine‐annelated pyridones24, 25were found to be easily available from ethyl 5‐methyl‐4‐

ISSN:0022-152X    

DOI:10.1002/jhet.5570260410

出版商:Wiley‐Blackwell    

年代:1989

数据来源: WILEY