“…Inter- or intramolecular cycloaddition reactions involving heterocyclic oQDMs provide an attractive route to heteropolycyclic compounds, and an increasing number of examples of such processes are to be found in recent review articles where the literature of the generation of heterocyclic oQDMs until 1993 is thoroughly reviewed . Thus, during the past decade a great deal of effort has been devoted to the syntheses of heteroanalogues of oQDM and furan ( 87 ), − pyrrole ( 88 ), thiophene ( 89 ), , oxazole ( 90 ), isoxazole ( 91 ), , pyrazole ( 92 ), , imidazole ( 93 ),116c thiazole ( 94 ), , isothiazole ( 95 ), triazole ( 96 ), pyridine ( 97 and 98 ), , pyridazine ( 99 ), pyrimidine ( 100 ), , pyrazine ( 101 ), pyrimidinone ( 102 ), benzofurano ( 103 ), , indolo ( 104 ), benzothieno ( 105 ), quinoline ( 106 and 107 ), quinoxaline ( 108 ), , quinolinone ( 109 ), coumarin ( 110 ), phenanthroline ( 111 ), and carbazole ( 112 ) based oQDMs (Scheme ). , 31 …”
Section: Generation Of O-quinodimethane
Heteroanaloguesmentioning
“…Inter- or intramolecular cycloaddition reactions involving heterocyclic oQDMs provide an attractive route to heteropolycyclic compounds, and an increasing number of examples of such processes are to be found in recent review articles where the literature of the generation of heterocyclic oQDMs until 1993 is thoroughly reviewed . Thus, during the past decade a great deal of effort has been devoted to the syntheses of heteroanalogues of oQDM and furan ( 87 ), − pyrrole ( 88 ), thiophene ( 89 ), , oxazole ( 90 ), isoxazole ( 91 ), , pyrazole ( 92 ), , imidazole ( 93 ),116c thiazole ( 94 ), , isothiazole ( 95 ), triazole ( 96 ), pyridine ( 97 and 98 ), , pyridazine ( 99 ), pyrimidine ( 100 ), , pyrazine ( 101 ), pyrimidinone ( 102 ), benzofurano ( 103 ), , indolo ( 104 ), benzothieno ( 105 ), quinoline ( 106 and 107 ), quinoxaline ( 108 ), , quinolinone ( 109 ), coumarin ( 110 ), phenanthroline ( 111 ), and carbazole ( 112 ) based oQDMs (Scheme ). , 31 …”
Section: Generation Of O-quinodimethane
Heteroanaloguesmentioning
“…9 The Schiff base side-chain of 4 easily underwent hydrolysis in the presence of alumina at higher temperature (i.e. in boiling xylene) and gave rise to the triazolopyridazinone 5, 10 a derivative of the heteroaromatic [1,2,3]triazolo[4,5-d]pyridazine ring system (saturated 11 and unsaturated derivatives 12,13 of this ring skeleton have been described elsewhere ).…”
The arylazo substituted salt 2 when treated with a base underwent a valence bond isomerization to yield a derivative of the heteroaromatic ring system, [1,2,3]triazolo[4,5-d]pyridazine (4). Scheme 1 (a) Ar = 4-ClC 6 H 4 -, (b) Ar = 4-NO 2 C 6 H 4 -, (c) Ar = 4-CH 3 OC 6 H 4 -.Fig. 1 A molecular diagram 9 of 4b with the numbering of atoms. Anisotropic displacement parameters represent 50% probabilities.
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