High water-soluble erythromycin A derivatives wherein the desosamine moiety is quaternized with an acyloxy-, benzoyloxy- or alkoxycarbonyl-(or carboxy)-acylmethyl iodide, bromine or chloride and esterified in the 2-position with loweralkyl or -
高水溶性红霉素 A 衍生物,其中脱糖胺分子与酰氧基-、苯甲酰氧基-或烷氧基羰基-(或羧基)-酰甲基碘化物、溴或氯进行季铵化,并在 2 位与低级烷基或-
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.
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