The last piece of the puzzle: Furan-2-yl anions are first demonstrated as robust γ-oxo and γ-hydroxyl acyl anion equivalents to convert aldehydes and ketones into trifunctionalized dihydroxyl ketones and hydroxyl diones through sequential nucleophilic addition, Achmatowicz rearrangement, and herein freshly established iridium-catalyzed highly selective transfer hydrogenation reduction.

中文翻译：

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通过铱催化化学选择性还原实现呋喃-2-基阴离子作为 γ-氧代/羟基酰基阴离子等价物

难题的最后一部分：呋喃-2-基阴离子首先被证明是强大的 γ-氧代和 γ-羟基酰基阴离子等价物，可通过顺序亲核加成、Achmatowicz 重排将醛和酮转化为三官能化二羟基酮和羟基二酮，本文中新建立的铱催化高选择性转移氢化还原反应。