The Ireland alcohol, a key intermediate for the synthesis of tirandamycin A, was prepared in a stereoselective manner, where titanium-mediated [2,3]Wittig rearrangement and iodolactonization were used as key steps for the construction of four consecutive asymmetric centers.
The synthesis of (±)-Ireland alcohol, a key intermediate for the synthesis of tirandamycin A, was achieved in a straightforward manner by using isopropyl (2R*, 3S*, 4E)-6-benzyloxy-2-hydroxy-3-methyl-4-hexenoate as a startingmaterial, which was readily obtained by the [2,3]Wittig rearrangement of isopropyl [(E)-1-benzyloxymethyl-2-butenyloxy]acetate via its titanium enolate.