2.3- Dihydropyrrole-2,3-dione

FVP-induced decarbonylation of the 2,3-dihydropyrrole-2,3-dione 304 (1996JOC1363, 1995TL6547) methoxy-substituted Meldrum s... 

Ring contraction of the tetrahydro-l,3-diazepine-2,4,5-trione (197) in boiling decalin took place with elimination of phenyl isocyanate this method represents the conversion of a 2,3-dihydrofuran-2,3-dione (196) into a 2,3-dihydropyrrole-2,3-dione (198) thermolysis in the absence of solvent led to the quinoline (199). The zwitterionic 2,4-dioxopyrrolidine (200) was obtained in moderate yield by the condensation of o-(a-hydroxycinnamoyl)benzoic acid with tripiperidinomethane in ether-DMF at room temperature. ... 

Dihydrooxazin-2,3-diones can be prepared by Baeyer-Villiger oxidation of dihydropyrrole-2,3-diones (Equation 51, Table 9). 

Chlorination of 2-(pyrrol-l-yl)pyrrole 330 with sulfuryl dichloride gave the natural 2,3,4-trichloro-l-methyl-5-(perchloropyrrol-l-yl)pyrrole (Ql) 331 in 16% yield (Scheme 74) <2002AGE1740>. Treatment of l-(pyrrol-2-yl)dihy-dropyrrole-2,5-dione 329 with PCls at 55°C gave l-(l-methyl-3,4,5-trichloropyrrol-2-yl)dihydropyrrole-2,5-dione 332. Treatment of compound 329 with a mixture of phosphorus pentachloride and phosphorus oxochloride at 100 °C provided Ql in a yield of 7%. 

Beilstein Handbook Reference) AI3-08539 BRN 0108440 Butanimide Dihydro-3-pyrroline-2,5-dione 3,4-Dihydropyrrole-2,5-dione 2,5-Diketo-pyrrolidine 2,5-... 

Dihydropyrrole-2,5-dione 3,4-Dihydropyrrolidine. See Succinimide 5,12-Dihydroquino [2,3-b] acridine-7,14-dione. See Pigment violet 19 Dihydrosafrol. See Dihydrosafrole Dihydrosafrole CAS 94-58-6... 

Since vinyl azides like 34 are electron-rich olefins, [2 + 2] cycloaddition with electron-deficient alkenes such as diphenylketene could lead to azidocyclobutanes. " The stability of the cycloadducts 211, prepared from 34 or 52 and tetracyanoethene (TCNE), allowed characterization in solution but not isolation of these products because rapid ring-expansion regioselectively afforded the dihydropyrroles 212 already at room temperature (Scheme 5.25). "" A similar mechanism via [2 + 2] cycloaddition and quick ring-enlargement may perhaps explain the formation of 213 from 52 and 4-phenyl-l,2,4-triazole-3,5-dione (PTAD). In this " " and other " " cases, however, different interpretations were offered. The 2-azidobuta-l,3-dienes 92a,b underwent [4 + 2] cycloaddition in the... 

---