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Aromatic nucleophilic substitution. Part 2. Preparation of novel 3-substituted xanthone and thioxanthone derivatives

✍ Scribed by Walter Fischer; Vratislav Kvita

Publisher
John Wiley and Sons
Year
1985
Tongue
German
Weight
442 KB
Volume
68
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

The novel 3‐nitro‐9‐oxo‐9__H__‐xanthene‐ and 3‐nitro‐9‐oxo‐9__H__‐thioxanthene‐l‐carboxylic acids 2a–d were prepared by intramolecular acylation of 3‐aryloxy‐ and 3‐arylthio‐5‐nitrophthalic anhydrides 1 (Scheme). The 3‐nitro group was readily substituted by O‐ and S‐nucleophiles and halide and azide ions to give a range of 3‐substituted thioxanthone derivatives 3 with varied λ~max~.

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