Abstract
An efficient and convenient process is described for the first preparation of a new diarylheptanoid, renealtin A, isolated from the seeds of the Brazilian medicinal plant Renealmia exaltata. The key trisubstituted tetrahydrofuran ring was constructed through Lewis acid mediated stereoselective allylation of the lactol derivative by featuring the elaboration of the functionalized homochiral lactone derived from l-tartaric acid. The synthesis of the other minor stereoisomer, renealtin B, was also established.
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