Selective deprotection of peracetylaucubin (3) by use of KCN led to 6-O-ace
tylaucubin (4), which was readily converted into 2',3',4',6',10-penta-O-ben
zoylaucubin (7). Configuration inversion performed on 7, using a modified M
itsunobu reaction, followed by deprotection, afforded 6-epi-aucubin (2).