[摘要]:(Biomolecules and Their Synthetic Analogs) Section The right half (I) of (+)-pederin was synthesized through a convenient and efficient asym. synthesis in 14 steps with 8.3% overall yield. The key step was an iodine-induced heterocyclization to construct the pyran ring. The chiral centers were constructed sep. via asym. allylation, substrate-controlled diastereoselective reactions, and Sharpless asym. dihydroxylation.