Compounds of formula (I) or their pharmaceutically acceptable salts, or their stereoisomers or mixtures of stereoisomers, where: R
1
is selected from the group consisting of: phenyl, and phenyl mono-, di-, or tri-substituted by a radical independently selected from the group consisting of F, Cl, Br, I, (C
1
-C
6
)-alkyl, COO-(C
1
-C
6
)-alkyl, and (C
1
-C
6
)-alkoxy; and R
2
is a radical selected from the same group as R
1
, further including a phenyl substituted in 4-position by a radical independently selected from the group consisting of —O(CH
2
)CONH(CH
2
)
3
CH
3
and OCH
2
COOC(CH
3
)
3
, a biphenyl-4-yl, thiazol-2-yl, and a thiazol-2-yl mono- or di-substituted by a radical selected from F and phenyl; inhibit cell proliferation of tumor cells independently of p53 protein and may also induce apoptosis in several tumor cells independently of p53 protein, being useful for the treatment of several types of cancer.
Mono- and trifluorination of the thiazole ring of 2,5-diarylthiazoles using N-fluorobenzenesulfonimide (NFSI)
作者:Julie M. Hatfield、Cheryl K. Eidell、Chad E. Stephens
DOI:10.1016/j.tetlet.2012.12.052
日期:2013.2
Fluorination of select 2,5-diarylthiazoles using the N-F reagent N-fluorobenzenesulfonimide (NFSI) has led to the formation of both the anticipated 4-fluorothiazole as well as a unique 4,4,5-trifluorothiazole. Selective monofluorination is best achieved using bromobenzene as solvent at 155 degrees C, while trifluorination is best achieved by performing the reaction without solvent at 135-140 degrees C. An X-ray crystal structure has been obtained on one of the trifluorinated products. (C) 2012 Elsevier Ltd. All rights reserved.