cheminform abstract: ring transformations of heterocyclic compounds. part 18....

2000 indole derivatives, isoindole derivatives indole derivatives, isoindole derivatives R 0140 14 - 103 Ring Transformations of Heterocyclic Compounds. Part 18. Spiro[cyclohexadiene-indolines] with Three Stereocenters from Pyrylium Salts and Chiral Methyleneindolines – An Example of a High Diastereoselective Ring Transformation. — The diastereoselective synthesis of 6-aroyl-diarylspiro-indolines (III) from triarylpyrylium perchlorates (I) and methyleneindolines derived from (II) in the presence of triethylamine/acetic acid in ethanol by a 2,5-[C 4 +C 2 ] pyrylium ring transformation is reported. Structure elucidation is performed by X-ray spectroscopic analysis. — (ZIMMERMANN, THOMAS; ABRAM, ULRICH; J. Heterocycl. Chem. 36 (1999) 5, 1223-1230; Inst. Org. Chem., Univ. Leipzig, D-04103 Leipzig, Germany; EN) 1

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Page 1: ChemInform Abstract: Ring Transformations of Heterocyclic Compounds. Part 18. Spiro[cyclohexadiene-indolines] with Three Stereocenters from Pyrylium Salts and Chiral Methyleneindolines

2000 indole derivatives, isoindole derivatives

indole derivatives, isoindole derivativesR 0140

14 - 103Ring Transformations of Heterocyclic Compounds. Part 18.Spiro[cyclohexadiene-indolines] with Three Stereocenters fromPyrylium Salts and Chiral Methyleneindolines – An Example of aHigh Diastereoselective Ring Transformation. — The diastereos-elective synthesis of 6-aroyl-diarylspiro-indolines (III) from triarylpyryliumperchlorates (I) and methyleneindolines derived from (II) in the presence oftriethylamine/acetic acid in ethanol by a 2,5-[C4 + C2] pyrylium ring transfor-mation is reported. Structure elucidation is performed by X-ray spectroscopicanalysis. — (ZIMMERMANN, THOMAS; ABRAM, ULRICH; J. Heterocycl.Chem. 36 (1999) 5, 1223-1230; Inst. Org. Chem., Univ. Leipzig, D-04103Leipzig, Germany; EN)

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