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Spirobipyridopyrans and indolinospiropyridopyrans: Synthesis, x-ray crystal structure, separation of enantiomers, and barriers to thermal cleavage of the C(sp3)-O bond

✍ Scribed by Linda Lončar-Tomašković; Nikola Pustet; Draginja Mrvoš-Sermek; Ante Nagl; Mladen Mintas; Albrecht Mannschreck


Publisher
John Wiley and Sons
Year
2001
Tongue
English
Weight
281 KB
Volume
13
Category
Article
ISSN
0899-0042

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Chiral spirobinaphtopyrans 1-9 were synthesised using the acid catalyzed aldol condensation of 2-hydroxy-1-naphthaldehyde or 1-hydroxy-2-naphthaldehyde with the appropriate ketone and subsequent reaction of the isolated pyrylium salt with base. Separation or enrichment of enantiomers was accomplishe