An efficient chemo-enzymatic approach towards variably functionalized benzotropolones
摘要:
An efficient three-step synthesis for benzotropolones via three catalytic steps is presented. Pyrogallol phenones are formed in the first step starting from pyrogallol, which is acylated by proton-catalysis. Catalytic hydrogenation of the phenones yields the corresponding alkylated pyrogallyl dervatives. In the final enzyme-catalyzed step the pyrogallol derivatives are annulated to form the benzotropolone cores. An alternative pathway via the Pechmann reaction is also presented. The combination of the three catalytic steps gives access to a wide range of benzotropolone congeners. (C) 2010 Elsevier Ltd. All rights reserved.
Some pyrogallol and catecholderivatives were synthesized, and their urease inhibitory activity was evaluated by using acetohydroxamic acid (AHA), a well known Helicobacter pylori urease inhibitor, as positive control. The assay results indicate that many compounds have showed potential inhibitory activity against H. pylori urease. 4-(4-Hydroxyphenethyl)phen-1,2-diol (2a) was found to be the most potent
STABILIZATION OF HOUSEHOLD, BODY-CARE AND FOOD PRODUCTS BY USING BENZOTROPOLONE CONTAINING PLANT EXTRACTS AND/OR RELATED BENZOTROPOLONE DERIVATIVES
申请人:Wagner Barbara
公开号:US20120230925A1
公开(公告)日:2012-09-13
Disclosed is the use of benzotropolone derivatives of formula (1), wherein R
1
, R
2
and R
7
independently from each other are hydrogen; C
1
-C
3
alkyl; or COR
8
; R
3
is hydrogen; or COOR
9
R
4
is hydrogen; or C
1
-C
3
alkyl; R
5
is hydrogen; hydroxy; C
1
-C
3
-alkoxy; or -0-(CO)—R
10
; R
6
is hydrogen; C
1
-C
3
alkyl; or COR
8
; or R
5
and R
6
together may form a five or six membered ring; or R
6
and R
7
together form a five or six membered ring; and R
8
, R
9
, R
10
independently of each other are C
1
-C
30
alkyl; for protecting body-care and household products from photolytic and oxidative degradation.