Acid-promoted sequential cationic cyclizations for the synthesis of (±)-taiwaniaquinol B
作者:Shuoliang Li、Pauline Chiu
DOI:10.1016/j.tetlet.2008.01.084
日期:2008.3
A formal total synthesis of (±)-taiwaniaquinol B starting from (E/Z)-citral has been accomplished by sequential cationiccyclizations promoted by acids. The cyclization to an α-cyclogeranyl ketone derivative is promoted by Lewis acid, whereas the use of Brønsted acid promotes an olefin isomerization leading to undesired cyclizations. The final ring formation to give the hydrofluorenone skeleton is