Copper-Catalyzed Diastereoselective Addition of Diborylmethane to N-tert-Butanesulfinyl Aldimines: Synthesis of β-Aminoboronates

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• 作者：Jinyoung Park ; Yeosan Lee ; Junghoon Kim ; Seung Hwan Cho
• 刊名：Organic Letters
• 出版年：2016
• 出版时间：March 4, 2016
• 年：2016
• 卷：18
• 期：5
• 页码：1210-1213
• 全文大小：363K
• ISSN：1523-7052

文摘

We have developed a highly chemo- and diastereoselective alkylation of N-tert-butanesulfinyl aldimines with diborylmethane. Whereas the addition of diborylmethane under metal-free conditions shows poor diastereoselectivity, the use of a copper catalyst and a bidentate phosphine ligand significantly enhances the diastereoselectivity, providing chiral β-aminoboronates in good yields. On the basis of the stereochemical outcome, we propose that the reaction likely proceeds via a boron-chelating six-membered chairlike transition state.