APPLICATION OF FLUOROCARBETHOXY-SUBSTITUTED PHOSPHONATE: A FACILE ENTRY TO SUBSTITUTED 2-FLUORO-3-OXOESTERS
作者:Hou-Jen Tsai
DOI:10.1080/10426509708043541
日期:1997.7.1
Abstract Diethyl(fluorocarbethoxymethyl)phosphonate 1a or diisopropyl(fluorocarbethoxymethyl)phosphonate 1b, prepared from triethyl phosphite or triisopropylphosphite with ethyl bromofluoroacetate, react with n-butyllithium in THF to give the corresponding phosphonate carbanions [(RO)2P(O)CFCO2Et]−Li+ 2a (R=Et) and 2b (R=i-Pr). Addition of trimethylsilyltrifluoroacetate CF3C(O)OSiMe3 to a THF solution
Tetrafluorine-Containing Ketones and Acetoacetates: Synthesis and Mechanistic Study
作者:Hou-Jen Tsai、Chi-Wei Hsieh
DOI:10.1002/jccs.200700107
日期:2007.6
corresponding intermediates [CF 3 C(O)CFPh] - Li + (10) and [CF 3 C(O)CFCO 2 Et]Li + (11), respectively. Subsequent protonation, alkylation or allylation of 10 and 11 afforded trifluoromethyl fluorobenzyl ketones 12 and ethyl 2,4,4,4-tetrafluoroacetoacetates 13. Based on the results obtained, a plausible mechanism was proposed.
The present invention relates to a compound of the formula ##STR1## wherein X.sup.1, R.sup.1, R.sup.2, OP, R.sup.3, R.sup.4, R.sup.5, R.sup.6, and R.sup.0 are as described herein, and their pharmaceutically acceptable salts thereof carrying an acidic and/or basic substituent. The compound of formula I as well as their pharmaceutically acceptable salts inhibit DNA gyrase activity in bacteria and possess antibiotic, especially antibacterial activity against microorganisms and can be used in the control or prevention of infectious diseases.
However, the typical inertness of unactivated Si-C(sp3) bondsunder conventional reaction conditions has hampered the application of simple tetraalkylsilanes in organic synthesis. Herein we report the chemoselective cleavage of Si-C(sp3) bonds of unactivated tetraalkylsilanes using iodine tris(trifluoroacetate). The reaction proceeds smoothly undermildconditions (-50 °C to room temperature) and tolerates
[EN] NUCLEOSIDE ANALOGUES WITH ANTIVIRAL ACTIVITY<br/>[FR] ANALOGUES DE NUCLEOSIDES A ACTIVITE ANTIVIRALE
申请人:UNIV CATANIA
公开号:WO2005082896A1
公开(公告)日:2005-09-09
Described herein are nucleoside analogues of formula (I) having antiviral activity; the process for their preparation, and their use for the preparation of pharmaceutical compositions useful in the treatment of viral pathologies.