Chiral vicinal diols as platforms for separable diastereomers in Johnson–Claisen rearrangement: a new short route to (−)-nor-canadensolide, (−)-canadensolide and (−)-sporothriolide
摘要:
The chiral vicinal diols prepared by asymmetric dihydroxylation in high enantioselectivities provide an excellent platform for separable diastereomers in the Johnson-Claisen rearrangement. The separated syn-diastereomers were converted into the advanced gamma-(lactone-lactol) intermediates (in six steps, 26-27% overall yields) for the synthesis of (-)-nor-canadensoiide, (-)-canadensolide and (-)-sporothriolide. (C) 2009 Elsevier Ltd. All rights reserved.
A simple route to enantiopure bis-lactones: synthesis of both enantiomers of epi-nor-canadensolide, nor-canadensolide, and canadensolide
作者:Sujit Mondal、Subrata Ghosh
DOI:10.1016/j.tet.2008.01.009
日期:2008.3
A simple strategy has been developed for the synthesis of bothenantiomers of nor-canadensolide, epi-nor-canadensolide, and an intermediate to canadensolide. An orthoester Claisen rearrangement of an appropriately constructed allyl alcohol derivative prepared from R-(+)-2,3-di-O-cyclohexylidine glyceraldehyde followed by epoxidation of the resulting unsaturated esters produced hydroxy-lactones, which
Synthesis of β,γ-disubstituted-γ-lactones through a Johnson–Claisen rearrangement: a short route to xylobovide, nor-canadensolide, canadensolide, sporothriolide and santolinolide
作者:Rodney A. Fernandes、Arun B. Ingle、Vijay P. Chavan
DOI:10.1016/j.tetasy.2009.11.018
日期:2009.12
The Johnson-Claisen rearrangement of allyl alcohols with chiral vicinal diol functionality was employed to access chiral beta,gamma-disubstituted-gamma-lactones in high enantio- and diastereoselectivity. These were efficiently converted into nor-canadensolide, the advanced gamma-(lactone-lactol) intermediate for xylobovide, canadensolide and sporothriolide and the lactone moiety of the santolinolides. (C) 2009 Elsevier Ltd. All rights reserved.
Chiral vicinal diols as platforms for separable diastereomers in Johnson–Claisen rearrangement: a new short route to (−)-nor-canadensolide, (−)-canadensolide and (−)-sporothriolide
作者:Rodney A. Fernandes、Arun B. Ingle
DOI:10.1016/j.tetlet.2008.12.084
日期:2009.3
The chiral vicinal diols prepared by asymmetric dihydroxylation in high enantioselectivities provide an excellent platform for separable diastereomers in the Johnson-Claisen rearrangement. The separated syn-diastereomers were converted into the advanced gamma-(lactone-lactol) intermediates (in six steps, 26-27% overall yields) for the synthesis of (-)-nor-canadensoiide, (-)-canadensolide and (-)-sporothriolide. (C) 2009 Elsevier Ltd. All rights reserved.