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The enantioselective formal [2+4] annulation of 5‐alkenyl thiazolones with hydroxyl‐substituted para‐quinone methides was disclosed by dipeptide‐based phosphonium salt catalysts. A wide range of functionalized spiro‐chroman‐thiazolone molecules bearing three contiguous 3° and/or 4° stereocenters were readily constructed in high yields with excellent stereoselectivities (>20:1 dr and up to >99...
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