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Abstract
The synthesis of hitherto unknown 1-benzoyl-1′,3′,3′-trimethyl-4,6-diphenylspiro[1,2-dihydropyridine-2,2′-indolines] 5 from 2,4,6-triphenyl-1,3-oxazinium tetrafluoroborate (1b) and 1,3,3-trimethyl-2-methyleneindolines 2 (used as such or generated in situ from the corresponding 3H-indolium salts 4) in the presence of triethylamine in anhydrous acetonitrile by a 3,6-[C3N+C2] 1,3-oxazinium ring transformation is reported. Structure elucidation is performed by an X-ray structure determination of the spiro[dihydropyridine-indoline] 5a. Spectroscopic data of the transformation products and their mode of formation are discussed.
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