Allylsilane-based annulations. Direct stereoselective syntheses of (.+-.)-graveolide and (.+-.)-aromaticin
摘要:
An allylsilane-based annulation was used to construct a functionalized perhydroazulene. The C(1), C(5), and C(10) stereocenters, characteristic of the helenanolides, were established using a reductive alkylation strategy. Stereoselective syntheses of the pseudoguaianolides graveolide and aromaticin were achieved.