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- W2950098862 abstract "2,4,6-Triarylpyrylium perchlorates 1 react with methyleneindolines 3 in situ generated from the corresponding methylindolium salts 2, which are spiro-fused with a cycloalkane, benzanellated cycloalkene or a heterocyclic system. These diastereoselective 2,5-[C4+C2] pyrylium ring transformations are carried out in the presence of triethylamine/acetic acid in boiling ethanol to give the dispiroindolines 4 with a trans configuration of the more bulky substituents at the cyclohexadiene ring. By the same type of transformation the dispiro compounds 7/10 with an additional fused benzene ring are obtained from the pyrylium salt 1a and 6/9, the benzo-fused analogues of 3. Spectroscopic data of the transformation products as well as their mode of formation are discussed." @default.
- W2950098862 created "2019-06-27" @default.
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- W2950098862 date "2002-03-01" @default.
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- W2950098862 title "Ring transformations of heterocyclic compounds.XXI. Diastereoselective built-up of an aroylcyclohexadiene moiety as second spiro-connected ring at spiroindolines by pyrylium ring transformation" @default.
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- W2950098862 doi "https://doi.org/10.1002/jhet.5570390202" @default.
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