A Novel Approach to Monobenzannulated Spiroketals Using Styrenes in the Kulinkovich Reaction
作者:Margaret Brimble、Isabell Haym
DOI:10.1055/s-0029-1217708
日期:2009.9
The synthesis of a series of 5,6-monobenzannulated spiroketals is reported. The use of various styrenes in a Kulinkovich reaction with an appropriately functionalized aliphatic ester affords cyclopropanol products which under basic conditions underwent ring opening to form ketone precursors to the spiroketals. Deprotection of the hydroxyl groups and subsequent cyclization afforded monobenzannulated spiroketals related to the core structure of berkelic acid.
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