A Flexible Approach to 6,5-Benzannulated Spiroketals
作者:Zoe E. Wilson、Jonathan G. Hubert、Margaret A. Brimble
DOI:10.1002/ejoc.201100345
日期:2011.7
A novel route to simple 6,5-benzannulatedspiroketal analogues has been developed. A convergent Horner–Wadsworth–Emmons olefination enabled ready assembly of the spiroketal precursors. Use of a benzyl protecting group strategy enabled an efficient one-pot hydrogenation/deprotection/spiroketalisation process to be employed providing a robust method to access a range of substituted aromatic monobenzannulated
Synthesis of benzannulated spiroacetals using chiral gold–phosphine complexes and chiral anions
作者:Rachelle Quach、Daniel P. Furkert、Margaret A. Brimble
DOI:10.1016/j.tetlet.2013.08.077
日期:2013.10
The development of an asymmetric gold-catalysed dihydroalkoxylation strategy for the synthesis of the 3'H-spiro[chroman-2,1'-isobenzofuran] spiroacetal ring system 5 is described. Spiroacetal was generated in up to 87:13 enantiomeric ratio using chiral gold-phosphine complexes and chiral silver phosphate Ag(S)-TRIP. Crown Copyright (C) 2013 Published by Elsevier Ltd. All rights reserved.