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A stereoselective synthesis of the naturally occurring, α,β-unsaturated lactone anamarine is described. The key step was a highly stereoselective aldol reaction of a protected erythrulose derivative with a chiral aldehyde. Another relevant step was an asymmetric aldehyde allylation with a chiral allylborane. The lactone ring was made by means of a ring-closing metathesis.
We have investigated a series of aldol additions of protected l-erythrulose derivatives mediated by dicyclohexyl boron chloride. The syn/anti stereoselectivity has been found to depend on the type of protecting groups on the hydroxyl functions at C-3 and C-4. Thus, erythruloses benzylated at these hydroxyl groups gave only syn aldols while the corresponding benzoylated derivatives gave anti aldols...
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