期刊
DYES AND PIGMENTS
卷 76, 期 3, 页码 590-595出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2007.02.007
关键词
indandione; indanone; indeno[2,1-b]thiophene; gewald reaction
Condensation of 3-dicyanovinylindan-1-one 3 with arylamines 5a-5c afforded 2-[3-(substituted-amino)-inden-1-ylidene]-malononitriles 7a-7c, which were converted to 2-amino-indeno[2,1-b]thiophene 8a-8c using the Gewald reaction. Cyclization of ethyl (1-indanylidene)-cyanoacetate 4 with elemental sulfur gave 2-amino-8H-indeno[2,1-b]thiophene-3-carboxylic acid ethyl ester 9. Acetylation of 9 with acetic anhydride afforded the 2-acetyl compound 11, which was condensed with arylaldehydes 12a-12c to yield the corresponding 2-amino-indeno[2,1-b]thiophene moiety 13a-13c containing a methine chromophore located at the 8-position using the Knoevenagel reaction. Compound 9 was condensed with N,N-dimethylaminobenzaldehyde 12d in piperidine to afford the corresponding 2-amino-indeno[2,1-b]thiophene compound 13d. Electronic absorption spectra of these compounds were discussed. (c) 2007 Elsevier Ltd. All rights reserved.
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