Stéréospécificité de l'addition de Michael d'ènethiolates avec les énones acycliques
作者:Kafui Kpegba、Patrick Metzner、Rosé Rakotonirina
DOI:10.1016/s0040-4020(01)80066-1
日期:1989.1
E-enones (3-penten-2-one, chalcone) occurs with high stereospecificity: anti/syn product ratios are identical to the cis/trans enethiolate ratios. A pseudo-cyclic transition state is proposed with substituents of the enone C-C doublebond occupying favorable equatorial positions. The 1,4-addition reaction is kineticaly controlled. In contrast to ester enolates, enethiolates allow the use of enones without
Oxazolidinone antibacterial agents having a thiocarbonyl functionality
申请人:Pharmacia and Upjohn Company
公开号:US06342513B1
公开(公告)日:2002-01-29
The present invention provides compounds of Formula 1:
or pharmaceutical acceptable salts thereof wherein A, G and R1 are as defined in the claims which are antibacterial agents.
本发明提供了式1化合物:
或药物可接受的盐,其中A,G和R1如权利要求中所定义,它们是抗菌剂。
Synthesis of N-Thioacylated amino sugars
作者:Rainer Isecke、Reinhard Brossmer
DOI:10.1016/s0040-4020(01)80197-6
日期:1993.1
Unsubstituted aminosugars readily react with dithiocarboxylic ester or O-ethyl thioformate to yield the hitherto unknown free N-thioacylated sugars which are of biological interest.
Completely regioselective reversals for an addition reaction of ambident sulphur nucleophiles to michael acceptors
作者:Kafui Kpegba、Patrick Metznei
DOI:10.1016/s0040-4039(00)98803-8
日期:1990.1
Reacion of titanium enethiolates with α-unsaturated ketones leads selectively to 3-hydroxy 4-saturated alkanedithioates, arising from a 1,2-carbon-addition, whereas aluminum enethiolates give oxoketene dithioacetals, from exclusove 1,4-sulphur-addition.
THE HIGHLY REGIOSELECTIVE COUPLING REACTION OF ALLYLIC ALCOHOLS WITH LITHIUM ENOLATE OF DITHIOESTERS USING 1-CHLORO-2-METHYL-<i>N</i>,<i>N</i>-TETRAMETHYLENEPROPENYLAMINE
作者:Tamotsu Fujisawa、Kazuto Umezu、Toshio Sato
DOI:10.1246/cl.1985.1453
日期:1985.10.5
1-Chloro-2-methyl-N,N-tetramethylenepropenylamine was found to be a good condensation reagent for the regioselective coupling reaction of allylic alcohols with lithium enolate of dithioesters under mild conditions to afford γ,δ-unsaturated dithioesters, which proceeds by a thio-Claisen rearrangement of S-allylic ketene dithioacetals initially formed.