摘要:

AbstractReaction of 6‐mercapto‐7H‐1,2,4‐triazolo[1,5‐d]tetrazole (1) wtih 1,2‐phenylenediamine affordedN‐{7H‐1,2,4‐triazolo[1,5‐d]tetrazol‐6‐yl}‐1,2‐phenylenediamine which was cyclized to benzimidazolyl‐1,2,4‐triazolo[1,5‐d]tetrazoles using various one‐carbon cyclizing agents. Also, the treatment of1with maleic anhydride or phthalic anhydride gave the corresponding thio derivatives followed by hydrazinolysis to afford the thio heterobicyclic systems. Former structures of the products have been established u

ISSN:0009-4536    

DOI:10.1002/jccs.200500021

出版商:WILEY‐VCH Verlag    

年代:2005

数据来源: WILEY

摘要:

AbstractSeveral quinazoline‐2(1H),4(3H)‐dione derivatives were synthesized from pyrimidine‐2(1H),4(3H)‐dione der

ISSN:0009-4536    

DOI:10.1002/jccs.200500022

出版商:WILEY‐VCH Verlag    

年代:2005

数据来源: WILEY

摘要:

AbstractSeveral heterocyclic systems such as 1,2,3‐triazoles (5–9), pyrimidotriazoles (10–13), benzothiazole (16), thiazolo (17), and pyrimidinone derivative (18) was obtained from 4‐aminobenzophenone (1) and the appropriate r

ISSN:0009-4536    

DOI:10.1002/jccs.200500023

出版商:WILEY‐VCH Verlag    

年代:2005

数据来源: WILEY

摘要:

AbstractA mild and efficient method has been developed for the selective deprotection of 1,1‐diacetates of aldehydes in excellent yields by means of the P2O5/SiO2reagent. Advantages of this method are the use of inexpensive and selective reagent, with high yields in simple operation, and short reaction time under solvent‐free conditi

ISSN:0009-4536    

DOI:10.1002/jccs.200500024

出版商:WILEY‐VCH Verlag    

年代:2005

数据来源: WILEY

摘要:

AbstractSynthesis of some benzoheterocyclic compounds like substituted benzofurans, 4‐methyl‐2H‐chromenes and 3,4‐dihydro‐2H‐benzo[b]oxepin‐5‐ones from 2‐hydroxyacetophenoneviabase induced cyclization and ring‐closing metathesis

ISSN:0009-4536    

DOI:10.1002/jccs.200500025

出版商:WILEY‐VCH Verlag    

年代:2005

数据来源: WILEY

摘要:

AbstractA tripodal naphthylacetamide derivative (I and II) used as anew enhancement fluorescence chemical sensor for detection of transition metal ions has been synthesized in this work. Two new derivatives were prepared in good yields according to the proposed method. The products were characterized by elemental analysis,1H NMR spectra, and mass spectrometry (MS).

ISSN:0009-4536    

DOI:10.1002/jccs.200500026

出版商:WILEY‐VCH Verlag    

年代:2005

数据来源: WILEY

摘要:

AbstractA convenient and useful esterification was realized, and this reaction proceeded without a dehydrating reagent or water removal equipment. A series ofortho‐hydroxyphenyl carboxylic acids and benzoic acids were transformed to their corresponding methyl esters under CAN/CH3OH reaction conditions. Whereas in an aprotic solvent, acetonitrile,sp3‐Ctetheredortho‐hydroxyphenyl carboxylic acids undergo simultaneouso,p‐dinitration and intramolecular esterification reactions in good yields. Also, 2‐((1E)‐2‐nitrovinyl)‐4‐nitro‐phenol (3e) showed selective cytotoxicities toward MCF‐7, HEP G2, and HEP 3B cell lines with IC50values of 23.50, 7.33, and 7.5

ISSN:0009-4536    

DOI:10.1002/jccs.200500027

出版商:WILEY‐VCH Verlag    

年代:2005

数据来源: WILEY

摘要:

AbstractThe hetero [6+3] cycloaddition of fulvenes to benzoquinones and iodoanilines provides an efficient route to the synthesis of cyclopenta[c]‐4H‐chromen‐8‐ol, benzo[d]cyclopenta[e]‐3H‐3‐azin‐8‐ol and other 11‐hetero steroids. The structure of the cyclopenta[c]chromene skeleton was confirmed by the X‐ray structure analysis of thep‐bromobenzoate of39. A small library consisting of 110 examples was prepared by reacting benzoquinones or io

ISSN:0009-4536    

DOI:10.1002/jccs.200500028

出版商:WILEY‐VCH Verlag    

年代:2005

数据来源: WILEY

摘要:

AbstractFive new flavonol glycosides characterized as syringetin 3‐O‐α‐rhamnoside‐7‐O‐β‐glucoside, syringetin 3‐O‐α‐rhamnoside‐7,4′‐di‐O‐β‐glucoside, quercetin‐7‐O‐β‐galactosyl (1→3)‐β‐galactoside, myricetin 3‐O‐α‐rhamnosyl (1→4)‐β‐galactoside and myricetin 3‐O‐β‐glucosyl (1→2)‐β‐glucoside‐7‐O‐β‐glucosyl‐(1→4)‐α‐rhamnoside have been isolated from a methanolic extract ofEmbelia keniensisleaves. Known flavonols isolated from the same extract included myricetin, quercetin, kaempferol, myricetin 3‐O‐α‐rhamnoside, myricetin 3‐O‐β‐glucoside, quercetin 3‐O‐α‐rhamnoside, quercetin 3‐O‐β‐glucoside, quercetin 3‐O‐β‐xyloside, isorhamnetin 3‐O‐α‐rhamnoside and myricetin 3

ISSN:0009-4536    

DOI:10.1002/jccs.200500029

出版商:WILEY‐VCH Verlag    

年代:2005

数据来源: WILEY