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Synthesis of 2‐(3‐tropolonyl)‐1‐benzopyrylium perchlorates and related compounds
Author(s) -
Wang DaoLin,
Lu DuRen,
Jin ZhongTian,
Imafuku Kimiaki
Publication year - 1995
Publication title -
journal of heterocyclic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.321
H-Index - 59
eISSN - 1943-5193
pISSN - 0022-152X
DOI - 10.1002/jhet.5570320405
Subject(s) - chemistry , perchloric acid , triethyl orthoformate , perchlorate , medicinal chemistry , organic chemistry , catalysis , ion
Abstract 3‐Acetyltropolone ( 1 ) reacted with 2‐hydroxybenzaldehyde ( 3a ) in the presence of perchloric acid in ethyl orthoformate to afford 2‐(3‐tropolonyl)‐1‐benzopyrylium perchlorate ( 4a ). The reactions with 2‐hydroxy‐5‐methylbenzaldehyde ( 3b ), 5‐chloro‐2‐hydroxybenzaldehyde ( 3c ), and 2‐hydroxy‐1‐naphthalde‐hyde ( 3d ) gave respectively the corresponding products 4b‐d . The reactions of 2‐acetyl‐7‐methylamino‐tropone ( 2 ) with 3a‐d also gave the corresponding products 5a‐d , respectively.