Abstract
[reaction: see text] A novel "protecting group-dependent" alkylation strategy was developed for complementary diastereoselective syntheses of alpha,alpha'-syn- and alpha,alpha'-anti-bis-alkenes 2 and 3, which represent ring-closing metathesis (RCM) substrates for medium-sized oxacycles. This principle has been applied to a stereoselective and concise total synthesis of (-)-isoprelaurefucin (4) in 14 steps in 12% overall yield from known epoxide 8.
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