1,721,059 research outputs found
NOVEL-APPROACH TO 1-ARYL-1H-4,1,2-BENZOXADIAZINES INVOLVING A SMILES REARRANGEMENT
No full textSome representatives of the title ring system have been obtained from ortho-(aryloxy)phenylhydrazonyl chlorides through a pathway involving (i) nitrile imide formation, (ii) Smiles rearrangement and (iii) intramolecular nucleophilic addition
1,3-Dipolar cycloadditions of 3,5-dichloro-2,4,6-trimethylbenzonitrile oxide to (phenylsulfonyl)allenes
No full textTHE INTRAMOLECULAR AZIDE CYCLOADDITION ROUTE TO TRIAZOLAM ANALOGS
No full textA facile synthesis of [1,2,3]triazolo[1,5-a][1,4]benzodiazepines starting from isatoic anhydrides and involving an intramolecular azide cycloaddition as the key step is reported
SITE SELECTIVITY AND REGIOSELECTIVITY OF NITRILE OXIDE CYCLOADDITIONS TO N,N-DIARYLAMINOALLENES
No full textSILVER CARBONATE PROMOTED REACTION OF HYDRAZONYL CHLORIDES WITH ALLYLIC ALCOHOLS
No full textThe title reaction affords two main kinds of products: (i) pyrazole derivatives due to cycloaddition of a nitrile imine intermediate to the ethylenic bond; (ii) open-chain carbonyl compounds due to the electrophilic attack of a nitrilium-like carbocation to the ethylenic bond. Mechanistic possibilities are discussed
SYNTHESIS OF [1,2,3]TRIAZOLO[1,5-A][4,1]BENZOXAZEPINE VIA INTRAMOLECULAR AZIDE CYCLOADDITION
No full textStarting from isatoic anhydride and propargyl alcohols, we developed a synthetic approach to the title compounds, where the key step is an intramolecular cycloaddition of the azido group onto the acetylenic bond
Intramolecular reactions of nitrilimines as a fruitful source of heterocycles
No full textThe multiform intramolecular reactivity of nitrilimines is presented in a systematic way, giving emphasis to its versatile potential in heterocyclic synthesis
5-Heterosubstituted 4-methylene-4,5-dihydroisoxazoles: ready accessibility and versatile reactivity
No full textThe title compounds are readily obtained by nitrile oxide cycloadditions to properly chosen dipolarophiles and display an intriguing variety of useful transformations which are here presented in a systematic way
Synthesis of Bis-(3,5)pyrazolophanes by Sequential Intermolecular-Intramolecular Nitrilimine Cycloadditions
No full textA series of bis-(3,5)pyrazolophanes of potential interest in supramolecular chemistry have been synthesized by exploiting sequential intermolecular-intramolecular cycloadditions of properly functionalised nitrilimines. (C) 1998 Elsevier Science Ltd. All rights reserved
DIPOLAROPHILIC BEHAVIOR OF PROPADIENYL SULFIDES TOWARDS 3,5-DICHLORO-2,4,6-TRIMETHYLBENZONITRILE OXIDE
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