Mechanistic Study of the Ru-Catalyzed Asymmetric Hydrogenation of Nonchelatable and Chelatable tert-Alkyl Ketones Using the Linear Tridentate sp3P/sp3NH/sp2N-Combined Ligand PN(H)N: RuNH- and RuNK-Involved Dual Catalytic Cycle

Mechanistic Study of the Ru-Catalyzed Asymmetric Hydrogenation of Nonchelatable and Chelatable tert-Alkyl Ketones Using the Linear Tridentate sp3P/sp3NH/sp2N-Combined Ligand PN(H)N: RuNH- and RuNK-Involved Dual Catalytic Cycle
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使用线性三齿 sp3P/sp3NH/sp2N 组合配体 PN(H)N 进行 Ru 催化不可螯合和可螯合叔烷基酮不对称氢化的机理研究:RuNH 和 RuNK 参与的双催化循环

DOI:
10.1021/acscatal.8b02671
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发表时间:
2018
期刊:
影响因子:
12.9
通讯作者:
Kitamura Masato
Kitamura Masato
中科院分区:
化学1区
文献类型:
--
作者:
Nakane Satoshi;Yamamura Tomoya;Manna Sudipta Kumar;Tanaka Shinji;Kitamura Masato

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线性三齿化合物sp3P/sp3NH/sp2N ligandPN(H)N((R)-2′-(diphenylphosphino)-N-(pyridin-2-ylmethyl)[1,1′-binaphthalen]-2-amine)在三个强接受π的配体的帮助下,在聚合体异构体上排他地生成FAc-[Ru(Pn(H)N)(Dmso)3](BF4)2。三个不同的配位原子对Ru-DMSO-Ru键的强度有不同的影响,从而实现了立体选择性的生成Ac-RuH(CH3O)(Pn(H)N)(DMSO)(RuNH)。RuNH在一定的催化量CH3OK存在下有效地氢化非螯合丁基甲基酮(BMK)和络合丁基甲氧基甲基酮(BMCK)。反应在H-sp3N-Ru-H双功能反应中心Ac-RuH_2(Pn(H)N)(Dmso)上进行,在由sp3N反式二甲基亚砜构成的手性三维空腔中获得了高的对映选择性,其构象由PYC(6)H-O═S氢键固定。我们用15N标记的Pn(H)N和C(3)-Ph-取代的Pn(H)N对RuNH、K酰胺RuNK、Ru二氢化合物和Ru氨基物种的结构进行了详细的核磁共振分析。BMK氢化速率受[CH3OK]0的影响很大,表现出一条特征曲线,先有一个峰,然后是伪负一级衰减。RuNH很容易被CH3OK去质子化生成RuNK,它的活性较低,但具有相同的对映体识别能力。在较高的[CH3OK]0时,慢RuNK周期的贡献增加会降低速率。曲线拟合分析和K+捕集实验支持RuNH-和RuNK参与的双催化循环。在BMCK的加氢反应中,由于BMCK优先于RuNH去质子化,所以只有RuNH循环起作用。
The linear tridentate sp3P/sp3NH/sp2N ligandPN(H)N((R)-2′-(diphenylphosphino)-N-(pyridin-2-ylmethyl)[1,1′-binaphthalen]-2-amine) exclusively formsfac-[Ru(PN(H)N)(dmso)3](BF4)2over the mer isomer with the help of the three strongly π-accepting DMSO ligands. The three different ligating atoms exert a divergent effect on thetrans-DMSO—Ru bond strengths, enabling the stereoselective generation offac-RuH(CH3O)(PN(H)N)(dmso) (RuNH).RuNHefficiently hydrogenates both nonchelatablet-butyl methyl ketone (BMK) and chelatablet-butyl methoxycarbonylmethyl ketone (BMCK) in the presence of a catalytic amount of CH3OK. The reaction proceeds at the H—sp3N—Ru—H bifunctional reaction site offac-RuH2(PN(H)N)(dmso), and high enantioselectivity is attained in a chiral 3D cavity constructed by the sp3N trans DMSO, the conformation of which is fixed by a PyC(6)H—O═S hydrogen bond. We determined the structures ofRuNH, the K amideRuNK, Ru dihydride, and Ru amido species by detailed NMR analysis using15N-labeledPN(H)Nand C(3)-Ph-substitutedPN(H)N. The rate ofBMKhydrogenation is significantly affected by [CH3OK]0, showing a characteristic curve with a peak followed by a pseudo-minus-first-order decay. TheRuNHis easily deprotonated by CH3OK to generateRuNK, which is less reactive but has the same enantioface discrimination ability. Increased contribution of the slowRuNKcycle decreases the rate at higher [CH3OK]0. TheRuNH- andRuNK-involved dual catalytic cycle is supported by curve-fitting analyses and K+trapping experiments. In hydrogenation ofBMCK, only theRuNHcycle operates becauseBMCKis preferentially deprotonated overRuNH.
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