Synthesis and structure–property evaluation of cellulose ω-carboxyesters for amorphous solid dispersions
作者:Haoyu Liu、Grace A. Ilevbare、Benjamin P. Cherniawski、Earl T. Ritchie、Lynne S. Taylor、Kevin J. Edgar
DOI:10.1016/j.carbpol.2012.11.049
日期:2014.1
of cellulose ω-carboxyalkanoates for ASDs, by reaction of cellulose with long-chain diacids that have been monoprotected as benzyl esters at one end, and monoactivated as acid chlorides at the other. Glass transition temperatures (Tg) of these cellulose ω-carboxyesters exceed ambient temperature by at least 50 °C, providing a sufficient ΔT to prevent drug mobility and crystallization. Cellulose acetate
Proteolysis-targetingchimera (PROTAC) is emerging as a promising technology in targetedproteindegradation and drug discovery. However, there is still a lack of effective chemical tools to real-time detect and track the proteindegradation. Herein, the first fluorescent and theranostic PROTACs were designed for imaging the degradation of nicotinamide phosphoribosyltransferase (NAMPT) in living cells
Syntheses and bioactivities of macrocyclic paclitaxel bis-lactones
作者:Changhui Liu、Jennifer K. Schilling、Rudravajhala Ravindra、Susan Bane、David G.I. Kingston
DOI:10.1016/j.bmc.2004.09.002
日期:2004.12
Five macrocyclic paclitaxel bis-lactones and their corresponding open chain taxoids were synthesized as models of the tubulin-binding conformation of paclitaxel. Macrocyclic lactones with a 19-21-membered ring underwent isomerization to form smaller rings. The lactones were evaluated for cytotoxicity and tubulin-polymerization ability. All five macrocyclic paclitaxel lactones were active, but less so than paclitaxel, while the rearranged macrocyclic lactones and the corresponding open-chain taxoids were much less active or inactive. (C) 2004 Elsevier Ltd. All rights reserved.
Chemo-enzymatic transformations of sensitive systems. Preparation of digoxigenin haptens via regioselective lipase mediated hydrolysis
作者:Maciej Adamczyk、John C. Gebler、Jonathan Grote
DOI:10.1016/0040-4039(95)01446-o
日期:1995.9
We investigated the use of lipase for the preparation of a series of digoxigenin haptens containing a 3-position carboxylic acid functionality. While synthesis of the required ester derivatives was straightforward, enzymatic transformation of the terminal esters to the corresponding acids was regioselective, but shown to be dependent on the length of the linking arm. This transformation was achieved while preserving other sensitive functionality.
mefloquine or triclosan). Combinations and hybrids showed remarkable antimalarial activity (IC50 = 0.6 to 1.1 nM for the best compounds), strong selectivity, and didn’t present any cross-resistance with artemisinin. Moreover, the combination triclosan + atovaquone showed highactivityagainst artemisinin-resistant parasites at the quiescent stage but the corresponding hybrid lost this pharmacological property