Coupling of Z-vinylic tellurides with alkynes catalysed by : synthesis of Z-enynes and Z-enediynes
摘要:
Vinylic tellurides of the Z-configuration couple with alkynes under PdCl2/CuI catalysis to give enynes and enediynes in good yields and with retention of the double bond configuration. (C) 1999 Elsevier Science Ltd. All rights reserved.
Regio- and stereoselective synthesis of Z-vinylic tellurides from propargylic alcohols: a route to chiral Z-enynes
作者:Cristiano Raminelli、Nathalia C. da Silva、Alcindo A. Dos Santos、André L.M. Porto、Leandro H. Andrade、João V. Comasseto
DOI:10.1016/j.tet.2004.10.087
日期:2005.1
tert-Butyldimethylsilyl ethers of propargylic alcohols are hydrotellurated regioselectively to give 1,2-Z-vinylic tellurides. Enantiomerically pure propargylic alcohols give enantiomerically pure vinylic tellurides, which are coupled with alkynes under Pd catalysis to give enantiomerically pure allylic enynols.
Differentiation and assignment of vinyl telluride regioisomers by <sup>1</sup>
H-<sup>125</sup>
Te <i>g</i>
HMBC
作者:Juliano C. R. Freitas、Dayvson J. Palmeira、Roberta A. Oliveira、Paulo H. Menezes、Ricardo O. Silva
DOI:10.1002/mrc.3826
日期:2012.7
Complete (1) H, (13) C, and (125) Te NMR spectral data for some vinyltellurides are described. The (1) H-(125) Te gHMBC experiment was used for the complete chemical shift assignment and structure elucidation of a mixture of regioisomers. The assignment ((125) Te NMR) and coupling constants (J(H,H) ) for all regioisomers are described for the first time.
Study of the Regioselectivity in the Hydrotelluration of Hydroxy Alkynes
作者:HÉLio A. Stefani、Lincoln D.G. Cardoso、ClaudÉTe J. Valduga、Gilson Zeni
DOI:10.1080/10426500108046647
日期:2001.5
Influence of different protecting groups on the regioselectivity of the hydrotelluration reaction of hydroxy alkynes
作者:Juliana M. Oliveira、Dayvson J. Palmeira、João V. Comasseto、Paulo H. Menezes
DOI:10.1590/s0103-50532010000200024
日期:——
The influence of protecting groups on the synthesis of regio- and stereodefined vinyl tellurides derived from the reaction of BuTeNa and propargylic- or homo-propargylic alcohols showed that TIPS silyl ether is useful as a regiodirecting group. The application of the methodology to the synthesis of a fragment of (+/-)-Seselidiol, a natural product, demonstrated the applicability of the new methodology.
Synthesis of 1,3-enynes via Suzuki-type reaction of vinylic tellurides and potassium alkynyltrifluoroborate salts
作者:Hélio A. Stefani、Rodrigo Cella、Felipe A. Dörr、Claudio M.P. Pereira、Gilson Zeni、Marlito Gomes
DOI:10.1016/j.tetlet.2004.11.160
日期:2005.1
The palladium-catalyzed cross-coupling reaction between potassium alkynyltrifluoroborate salts and vinylic tellurides proceeds readily to afford 1,3-enynes with moderate to good yields. (C) 2004 Elsevier Ltd. All rights reserved.