Total synthesis of (±)-phomactin A. Lessons learned from respecting a challenging structural topology.
Total synthesis of (±)-phomactin A. Lessons learned from respecting a challenging structural topology.
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DOI:
10.1021/jo200936r
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发表时间:
2011-09-02
影响因子:
3.6
通讯作者:
Hsung, Richard P.
中科院分区:
文献类型:
--
作者:
Buchanan, Grant S.;Cole, Kevin P.;Tang, Yu;Hsung, Richard P.
Our struggles and ultimate success in achieving a total synthesis of phomactin A are described. Our strategy features an intramolecular oxa-[3 + 3] annulation to construct its unique ABD-tricyclic manifold. Although the synthesis would constitute a distinctly new approach with the 12-membered D-ring of phomactin A being assembled simultaneously with the 1-oxadecalin at an early stage, the ABD-tricycle represents a unique structural topology that would pose a number of unprecedented challenges. One challenge concerned elaborating this tricycle to have oxygenation at the proper carbon atoms. To overcome this, we would utilize a Kornblum-DeLaMare ring-opening of a peroxide bridge as well as a challenging late-stage 1,3-allylic alcohol transposition. Further, the structural intricacies of the ABD-tricycle were uncovered by a conformational analysis that would be critical for the C5a-homologation.
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