Journal
ARKIVOC
Volume -, Issue -, Pages 215-226Publisher
ARKAT USA INC
DOI: 10.24820/ark.5550190.p011.662
Keywords
Pyrrolo[3; 2; 1-ij]quinoline-1; 2-dione; oxidation; m-chloroperbenzoic acid; 1; 3-oxazino[5; 4; 3-ij]quinolin-1; 3-dione; 1; 4-oxazino[2; 3; 4-ij]quinoline-2; 3-dione; oxidative recyclization; rearrangement
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Funding
- Russian Science Foundation [18-74-10097P]
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1,3-Oxazino[5,4,3-ij]quinolin-1,3-diones were obtained in good yields (64-86%) by oxidizing various pyrrolo[3,2,1-ij]quinoline-1,2-diones with m-chloroperbenzoic acid. The recyclization/rearrangement of the pyrroldione fragment of the starting materials selectively leads to the formation of a 1,3-oxazine cycle instead of an isomeric 1,4-oxazine ring.
When various pyrrolo[3,2,1-ij]quinoline-1,2-diones were oxidized with m-chloroperbenzoic acid, 1,3-oxazino[5,4,3-ij]quinolin-1,3-diones were obtained in good yields (64-86%) and characterized by spectral methods. Recyclization/rearrangement of the pyrroldione fragment of pyrrolo[3,2,1-ij]quinoline-1,2-diones, regardless of the presence and electronic nature of the substituent in the aromatic part, the presence of a bulky phenyl group or a multiple bond in the heterocyclic fragment, proceeds selectively with the formation of a 1,3-oxazine cycle, rather than an isomeric 1,4-oxazine ring. This outcome corresponds to the data acquired from quantum mechanical calculations.
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