Electrotelluration: A New Approach to Tri- and Tetrasubstituted Alkenes
作者:Joseph P. Marino、Hanh Nho Nguyen
DOI:10.1021/jo0110146
日期:2002.9.1
described in which a Michael addition of an alkyl or aryl tellurolate anion occurs onto an activated alkyne with subsequent trapping of a vinyl anion with electrophiles (aldehydes and ketones) other than a proton. This process provides an efficient regio- and stereospecific route to tri- and tetrasubstitutedalkenes. Methodologically significant examples of this chemistry were studied in which aryl and alkyl
Carbonyl transposition on organoselenium compounds
作者:João V. Comasseto、Wai L. Lo、Nicola Petragnani
DOI:10.1016/s0040-4020(97)00454-7
日期:1997.6
Carbonyl conjugated vinylic selenides undergo 1,3 and 1,5-carbonyl transposition sequences through organometallic reagents addition reactions followed by acid hydrolysis.
羰基共轭乙烯基硒化物通过有机金属试剂加成反应进行1,3和1,5-羰基转座序列,然后进行酸水解。
Addition of Z-vinylic higher order cyanocuprates to hindered enones. The influence of the reaction conditions
Z-Vinylic higherordercyanocuprates, prepared from the corresponding Z-vinylic tellurides, react efficiently with hindered enones in or in diethyl ether. In neat THF the hindered enones fail to react with Z-vinyl cyanocuprates prepared in this way.
Stereoselective synthesis and antitumoral activity of Z-enyne pseudoglycosides
作者:Claudio R. Dantas、Jucleiton J. R. de Freitas、Queila P. S. Barbosa、Gardenia C. G. Militão、Thiago D. S. Silva、Teresinha G. da Silva、Antônio A. S. Paulino、Juliano C. R. Freitas、Roberta A. Oliveira、Paulo H. Menezes
DOI:10.1039/c6ob00945j
日期:——
An efficient approach for the synthesis of Z-1,3-enynes based on the couplingreaction of Z-vinyl tellurides and alkynes containing a pseudoglycoside moiety is described. The products were obtained in good yields via a stereoselective way. Preliminary screening against three tumor cell lines indicated that the synthesized compounds are promising intermediates for the synthesis of an array of more potent
Ultrasound-assisted synthesis of Z and E stilbenes by Suzuki cross-coupling reactions of organotellurides with potassium organotrifluoroborate salts
作者:Rodrigo Cella、Hélio A. Stefani
DOI:10.1016/j.tet.2006.03.090
日期:2006.6
Palladium (0)-catalyzed cross-coupling reactions between potassium aryl- and vinyltrifluoroborate salts and aryl- and vinylic tellurides proceeds readily to afford the desired stilbenes in good to excellent yields. Stilbenes containing a variety of functional groups can be prepared.