Chemoselective reduction of β-butyltellanyl α,β-unsaturated carbonyl compounds to allylic alcohols
作者:Alcindo A. Dos Santos、Priscila Castelani、Bruno K. Bassora、José C. Fogo Junior、Carlos E. Costa、João V. Comasseto
DOI:10.1016/j.tet.2005.06.090
日期:2005.9
(Z)-β-Butyltellanyl α,β-unsaturated carbonyl compounds were stereoselectively produced by hydrotelluration of alkynones or by an addition/elimination sequence from enol tosylates. The β-butyltellanyl-enones were chemoselectively reduced with NaBH4/MeOH, NaBH4·CeCl3·7H2O/MeOH and DIBAL-H systems to the corresponding allylic alcohols with retention of the Z stereochemistry.
Tellurium in organic synthesis: synthesis of bioactive butenolides
作者:Bruno K. Bassora、Carlos E. Da Costa、Rogério A. Gariani、João V. Comasseto、Alcindo A. Dos Santos
DOI:10.1016/j.tetlet.2006.12.063
日期:2007.2
Reduction of (Z)-β-butyltelluro-enones gives the corresponding γ-hydroxy vinylic tellurides with retention of the double bond configuration. Reaction of γ-hydroxy vinylic tellurides with 2 equiv of n-butyllithium produces 1,4-C,O-dianions, which on reaction with carbon dioxide give the corresponding butenolides.