ISSN:0022-152X    

DOI:10.1002/jhet.5570180201

出版商:Wiley‐Blackwell    

年代:1981

数据来源: WILEY

ISSN:0022-152X    

DOI:10.1002/jhet.5570180202

出版商:Wiley‐Blackwell    

年代:1981

数据来源: WILEY

ISSN:0022-152X    

DOI:10.1002/jhet.5570180203

出版商:Wiley‐Blackwell    

年代:1981

数据来源: WILEY

摘要:

AbstractThe electron impact mass spectrometric fragmentation oftrans‐3‐ andtrans‐4‐styrylpyridazine is reported in detail, including a comparison with other aza‐stilbenes. With regard to a distinction between the two isomeric styrylpyridazines, the intensity ratio of the M+and [M‐1]+ions, the general degree of fragmentation and the elimination pathways of nitrogen proved to be most cha

ISSN:0022-152X    

DOI:10.1002/jhet.5570180205

出版商:Wiley‐Blackwell    

年代:1981

数据来源: WILEY

摘要:

Abstract6‐Alkylthio‐ and 6‐phenylthio‐5H‐benzo[a]phenoxazin‐5‐ones have been synthesized by the photochemical reaction of 5H‐benzo[a]phenoxazin‐5‐one with alkylth

ISSN:0022-152X    

DOI:10.1002/jhet.5570180206

出版商:Wiley‐Blackwell    

年代:1981

数据来源: WILEY

摘要:

AbstractThe synthesis of 2‐{2‐pyrrolylmethyl)‐ and 2‐(2‐indolylmethyl)tetrahydropyridines by condensation of 2‐cyanopyridines with appropriate pyrrole or indole derivatives followed by ketone reduction, quaternization and sodium borohydride reduction are described. The acid‐induced cyclization of 2‐(2‐pyrrolylmethyl)tetrahydropyridines affords 4,5,6,7,8,9‐hexahydro‐4,8‐methanopyrrolo[2,3‐d]azocine systems (pyrrolo[3,2‐f]‐morphans), although the method fails withN‐benzyl substituted pyrroles. The acid treatment of 2‐(2‐indolylmethyl)tetrahydropyridines and of 2‐indolyl tetrahydro‐2‐pyridyl ketones is not a suitable procedure for the preparation of indolo[3,2‐f]morphans, because of the protonation of ind

ISSN:0022-152X    

DOI:10.1002/jhet.5570180207

出版商:Wiley‐Blackwell    

年代:1981

数据来源: WILEY

摘要:

AbstractBy the action of thionyl chloride on 3(5)‐R‐4‐phenacylpyrazole‐5(3)‐carboxylic acid (3c,d), 3‐R‐5‐phenylpyrano[3,4‐c]pyrazole‐7‐(1H)ones (4c,d) were obtained. When4c,dwere treated with hydrazine hydrate followed by refluxing in ethanol containing acetic acid, 4,7‐dihydro‐3‐R‐5‐phenylpyrazolo[3,4‐d][1,2]‐diazepin‐8‐(1H)ones (6c,d) were formed. Compounds6c,d, in turn, were refluxed in ethanol saturated with hydrochloric acid to yield 6‐amino‐1,6‐dihydro‐3‐R‐5‐phenyl‐7H‐pyrazolo[3,4‐c]pyridin‐7‐ones (7c,d). Compounds7c,dcould be obtained directly from5c,d.The starting materials3c,dwere prepared by hydrolysis of the oxime of 3(5)‐R‐4‐phenacyl‐5(3)carboalcoxypyrazoles (1a,b). Structural assignments rested on correct elemental analysis, molecu

ISSN:0022-152X    

DOI:10.1002/jhet.5570180208

出版商:Wiley‐Blackwell    

年代:1981

数据来源: WILEY

摘要:

AbstractThe13C nmr chemical shifts of methoxy and acetoxyaurones are reported. The signals are assigned on the basis of substituent effects and comparison with structurally related compounds. Assignments are also verified by Sford.

ISSN:0022-152X    

DOI:10.1002/jhet.5570180209

出版商:Wiley‐Blackwell    

年代:1981

数据来源: WILEY

摘要:

AbstractBy treatment in boiling DMSO, benzothiazolines1yield 1,4‐benzothiazines4in some cases together with benzothiazoles. Two competing pathways, namely oxidative ring‐expansion and decomposition of benzothiazoline accounting for the formation of4and benzothiazoles, respectively, are sugges

ISSN:0022-152X    

DOI:10.1002/jhet.5570180210

出版商:Wiley‐Blackwell    

年代:1981

数据来源: WILEY

摘要:

AbstractThe cyclization reaction betweenN‐substituted dithiocarbamates (1) andN‐substitutedN‐chloromethylcarbamoyl chlorides (2) gives 3,5‐disubstituted tetrahydro‐2‐thioxo‐2H‐1,3,5‐thiadiazin‐4‐ones (3). In order to decide among the theoretically possible structures3‐5, the compounds6a,b, containing a thioxo group instead of an oxo group as in3a,b, as well as the S‐oxide derivative of3awas also established by X‐

ISSN:0022-152X    

DOI:10.1002/jhet.5570180211

出版商:Wiley‐Blackwell    

年代:1981

数据来源: WILEY