SEQUENTIAL [2,3]WITTIG AND CLAISEN REARRANGEMENT: A FACILE SYNTHETIC METHOD FOR (E,E)-4,7-ALKADIENALS AND -ALKADIENOIC ACIDS. A NEW FORMAL SYNTHESIS OF (±)-CERULENIN
Total synthesis of cytochalasin D: total synthesis and full structural assignment of cytochalasin O
作者:Eric Merifield、Eric J. Thomas
DOI:10.1039/a906412e
日期:——
with epoxidation being selective for the 17,18-double-bond and hydroxylation using osmiumtetroxide taking place selectively at the 6,7-double-bond. For completion of the synthesis of cytochalasin D 3, the 6,7-diol 26 was converted into the exocyclic alkene 30 by protection and dehydration. Further hydroxylation using osmiumtetroxide gave the diol 31 which was taken through to the enone 36 by protection
SEQUENTIAL [2,3]WITTIG AND CLAISEN REARRANGEMENT: A FACILE SYNTHETIC METHOD FOR (<i>E</i>,<i>E</i>)-4,7-ALKADIENALS AND -ALKADIENOIC ACIDS. A NEW FORMAL SYNTHESIS OF (±)-CERULENIN
作者:Koichi Mikami、Naoyuki Kishi、Takeshi Nakai
DOI:10.1246/cl.1981.1721
日期:1981.12.5
The regioselective [2,3]Wittig rearrangement of bis-allylic ethers followed by the Claisen rearragement permits ready access to (E,E)-4,7-alkadienals and -alkadienoic acids. The versatility of the sigmatropic sequence is demonstrated within the context of a new formal synthesis of (±)-cerulenin possessing an interesting spectrum of biological activities.