Expeditious synthesis of a key C9–C21 subunit of the aplyslatoxine and oscillatoxins
摘要:
The C9-C21 portion of the aplysiatoxin/oscillatoxin bluegreen algal metabolites was synthesized as the 9-aldehyde bearing a tert-butyldimethylsilyl ether group on the C11 hydroxyl and a trimethylsilyoxymethyl ether group on the C20 hydroxyl. Featuring an asymmetric aldol and an asymmetric oxazaborolidine reduction, the synthesis proceeded with high (> 90%) stereoselectivity in 13 steps and 5-7% overall yield from commercial starting material.