The hydrophobic sidechain of scyphostatin was synthesized by a convergent synthetic pathway. The key reactions were the enzymatic asymmetric acetylation of a meso-diol, construction of the C12′–C13′ trisubstituted E-olefin moiety by Negishi coupling, and construction of the (2′E,4′E ,E,6′E)-triene moiety by Horner–Wadsworth–Emmons olefination.
Synthesis (and Alternative Proof of Configuration) of the Scyphostatin C(1‘)−C(20‘) Trienoyl Fragment
作者:Thomas R. Hoye、Manomi A. Tennakoon
DOI:10.1021/ol0058386
日期:2000.5.1
[GRAPHICS]Each of four diastereomers of structure 2, corresponding to the lipophilic side chain of scyphostatin (1), were prepared. Careful analysis of their NMR spectral data and comparison with those of the natural product corroborates the recently reported (Org. Lett. 2000, 2, 505) stereochemical assignment. A strategy for the stereoselective synthesis of 2 has been achieved.