Simple and efficient routes to the natural alkaloid Cerpegin and new analogues are described herein. In a first approach, we extend the scope of a one pot three steps reaction, which permits the synthesis of new analogues of Cerpegin, substituted in different ways. In a second line of approach, we present an unprecedented synthesis of Cerpegin and analogues where methylfuranones are condensed with
Cerpegin-derived furo[3,4-c]pyridine-3,4(1H,5H)-diones enhance cellular response to interferons by de novo pyrimidine biosynthesis inhibition
作者:Simon Hayek、Nicolas Pietrancosta、Anna A. Hovhannisyan、Rodolphe Alves de Sousa、Nassima Bekaddour、Laura Ermellino、Enzo Tramontano、Stéphanie Arnould、Claude Sardet、Julien Dairou、Olivier Diaz、Vincent Lotteau、Sébastien Nisole、Gagik Melikyan、Jean-Philippe Herbeuval、Pierre-Olivier Vidalain
DOI:10.1016/j.ejmech.2019.111855
日期:2020.1
reports, we investigated the effect of P1788 on the cellular innate immune response. Here we show that pyrimidine depletion by P1788 amplifies cellular response to both type-I and type II interferons, but also induces DNA damage as assessed by γH2AX staining. Moreover, the addition of inhibitors of the DNA damage response led to the suppression of the P1788 stimulatory effects on the interferon pathway. This
α,β-Unsaturated γ- and δ-lactones were selectivity reduced to the corresponding saturated lactones and oxospiro systems respectively using sodiumborohydride in the presence of triethylamine in THF, in excellent yields.
Selective reduction of unsaturated γ- and δ-lactones by magnesium-methanol
作者:M. Bidar、G. Tokmajyan、F. Nasiri
DOI:10.1007/s10600-013-0434-2
日期:2013.1
Magnesium in methanol is an effective reagent for the selectivereduction of α,β-unsaturated γ- and δ-lactones for getting saturated derivatives of these compounds in high to excellent yields. Other reducible functionalities such as -CO2Et and -CN remain unaffected.
Synthesis of heterospirans containing a γ-lactone ring
作者:A. A. Avetisyan、G. G. Tokmadzhyan、R. A. Piridzhanyan
DOI:10.1134/s1070428008070221
日期:2008.7
Reactions of alpha-ketols with diethyl malonate at the molar ratio 2:1 in the presence of K(2)CO(3) were investigated. The heterospiranes obtained contained a dihydrofuran and a gamma-lactone rings. The optimum conditions for the synthesis of heterospiranes were found by varying the ratio of the initial compounds: alpha-ketoalcohol (or 2-ethoxycarbonyl-, 2-methoxycarbonyl-, 2-cyano-3,4,4-trimethyl-2-buten-4-olides), diethyl malonate, K(2)CO(3), by varying the environment, and also the temperature and the time of the reaction.