Synthesis of the C(1)-C(18) Segment of Lophotoxin and Pukalide. Control of 2-alkenylfuran (E/Z)-configuration
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[reaction: see text] The convergent synthesis of the fully functionalized C(1)-C(18) segment 24 of the furanocembranes lophotoxin and pukalide was accomplished in 11 steps and 10% overall yield. The key step was a stereoselective conversion of alkynoate 21 to trimethylsilyl 2-alkenylfuran 22.
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