Improved procedure for the hydrotelluration of alkynes
作者:Gilson Zeni、Henrique B. Formiga、João V. Comasseto
DOI:10.1016/s0040-4039(99)02297-2
日期:2000.2
Z-Vinylic tellurides were prepared by hydrotelluration of alkynes with lithium butyl tellurolate generated by reaction of n-butyllithium with elemental tellurium. (C) 2000 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.