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Photocyclization of 2‐[1]benzothien‐3‐yl)‐3‐phenylpropenoic acids
Author(s) -
Tominaga Yoshinori,
Castle Lyle W.,
Castle Raymond N.
Publication year - 1996
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.5570330452
Subject(s) - chemistry , cyclohexane , benzene , medicinal chemistry , thiophene , pyran , iodine , organic chemistry , thiopyran
Photocyclization of the substituted 2‐([1]benzothien‐3‐yl)‐3‐phenylpropenoic acids 3a‐c in the presence of iodine and air in a benzene‐cyclohexane mixture afforded a separable mixture of three compounds, benzo[ b ]naphtho[2,1‐ d ]thiophene‐6‐carboxylic acids 4a‐c , 6 H ‐benzo[ b ]naphtho[2,3‐ d ]thiopyran‐6‐ones 5a‐c , and 10‐methoxy‐2‐methyl‐6 H ‐benzo[ b ]naphtho[2,3‐ d ]pyran‐6‐one ( 6 ).