Tellurium in organic synthesis: a general approach to buteno- and butanolides
作者:Renan S. Ferrarini、Alcindo A. Dos Santos、João V. Comasseto
DOI:10.1016/j.tet.2012.09.074
日期:2012.12
The naturally occurring butanolides (−)-blastmycinolactol, (+)-blastmycinone, (−)-NFX-2, (+)-antimycinone as well as the four stereoisomers of the butenolide Acaterin were prepared in high enantiomeric purity using hydroxy-vinyl tellurides as starting materials.
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.
Tellurium in organic synthesis: a new approach to trisubstituted γ-butyrolactones with trans–trans relative stereochemistry. Total enantioselective synthesis of (−)-Blastmycinolactol, (+)-Blastmycinone, (−)-NFX-2, and (+)-Antimycinone
作者:Renan S. Ferrarini、Alcindo A. Dos Santos、João V. Comasseto
DOI:10.1016/j.tetlet.2010.10.089
日期:2010.12
The total synthesis of (-)-Blastmycinolactol, (+)-Blastmycinone, (-)-NFX-2, and (+)-Antimycinone was accomplished in few steps in high yields and ee, starting from enantiomerically enriched (S)-Z-vinylic hydroxytellurides. (C) 2010 Published by Elsevier Ltd.
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.