Computational Study on the Palladium-Catalyzed Allenylative Dearomatization Reaction

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• 作者：Ying Ren ; Jianfeng Jia ; Ting-Ting Zhang ; Hai-Shun Wu ; Wenxian Liu
• 刊名：Organometallics
• 出版年：2012
• 出版时间：February 13, 2012
• 年：2012
• 卷：31
• 期：3
• 页码：1168-1179
• 全文大小：604K
• 年卷期：v.31,no.3(February 13, 2012)
• ISSN：1520-6041

文摘

The detailed mechanism of the Pd-catalyzed coupling of naphthalene allyl chloride with allenyltributylstannane, resulting in the dearomatization of the naphthalene group, has been studied using density functional theory (DFT) calculations at the B3LYP level. The catalyst cycle can be divided into three main stages involving oxidative addition, transmetalation, and reductive elimination, none of which contains significantly large barriers. It is found that the oxidative addition takes place through a monophosphine pathway. The transmetalation step is responsible for the formation of the propargylic dearomatized product, due to the orientation of the metal-coordinated allenyl ligand. Reductive elimination of the dearomatized product from the intermediate (畏³-allylnaphthalene)(畏¹-allenyl)PdPH₃ occurs by coupling of the terminal carbon of the 畏¹-allenyl ligand with the ortho carbon of the 畏³-naphthalene ligand. Furthermore, it is shown that dichloromethane as solvent does not change the mechanistic picture significantly.