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Acid Catalyzed Aldehyde‐Indole Reaction, Synthesis of Indole Dyes
Author(s) -
Akgün Evüp,
Tunali Mustafa
Publication year - 1988
Publication title -
archiv der pharmazie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.468
H-Index - 61
eISSN - 1521-4184
pISSN - 0365-6233
DOI - 10.1002/ardp.19883210105
Subject(s) - indole test , chemistry , aldehyde , catalysis , cyanine , protonation , tetrafluoroborate , molecule , organic chemistry , combinatorial chemistry , ionic liquid , fluorescence , ion , physics , quantum mechanics
The reaction of the indoles 1 with antipyrine‐4‐carbaldehyde 2 in the presence of HBF 4 is investigated. The reaction is limited to reactive indole derivatives. The products contain two molecules of tetrafluoroborate. The antipyryl nucleus is O‐protonated. The structures of the cyanine dyes 3a–3d and 4 were elucidated by spectroscopic methods and elemental analysis.
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