A large-scale synthesis of enantiomerically pure γ-hydroxy-organochalcogenides
摘要:
Enantiomerically pure (R)- and (S)-gamma-hydroxy-organochalcogenides are prepared using poly-[R]-3-hydroxybutanoate (PHB) as the starting material. (C) 2009 Elsevier Ltd. All rights reserved.
Lipase-catalyzed kinetic resolution of (RS)-hydroxy tellurides
作者:Alcindo A. Dos Santos、Carlos E. Da Costa、Jefferson L. Princival、João V. Comasseto
DOI:10.1016/j.tetasy.2006.07.024
日期:2006.9
The enzymatic resolution of racemic mixtures of hydroxy tellurides with a range of lipases has been investigated. Lipase-B from Candida antarctica (CALB) gave the best conversions, providing both enantiomers with high enantiomeric purity. A comparative study of the effect of solvent and substrate on the enzymatic kinetic resolution was performed. (c) 2006 Elsevier Ltd. All rights reserved.
Tellurium/lithium exchange reactions in the synthesis of spiroketals and 1,6-dioxygenated systems
作者:Alcindo A. Dos Santos、Jefferson L. Princival、João V. Comasseto、Simone M.G. de Barros、José E. Brainer Neto
DOI:10.1016/j.tet.2007.03.178
日期:2007.6
O-dianions have been generated through concomitant acid/base and tellurium/lithium exchange reactions. The di-lithium salts were transmetallated with cerium chloride to the corresponding di-cerium salts and subsequently reacted with lactones and carboxylic acid anhydrides to yield the respective spiroketals. The di-lithium entities were also converted into the corresponding cyanocuprates that add in
A large-scale synthesis of enantiomerically pure γ-hydroxy-organochalcogenides
作者:Jefferson L. Princival、Morilo S.C. de Oliveira、Alcindo A. Dos Santos、João V. Comasseto
DOI:10.1016/j.tetasy.2009.10.009
日期:2009.12
Enantiomerically pure (R)- and (S)-gamma-hydroxy-organochalcogenides are prepared using poly-[R]-3-hydroxybutanoate (PHB) as the starting material. (C) 2009 Elsevier Ltd. All rights reserved.