Asymmetric Rh(II)/Pd(0) Relay Catalysis: Synthesis of α-Quaternary Chiral β-Lactams through Enantioselective C–H Insertion/Diastereoselective Allylation of Diazoamides,ACS Catalysis

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Asymmetric Rh(II)/Pd(0) Relay Catalysis: Synthesis of α-Quaternary Chiral β-Lactams through Enantioselective C–H Insertion/Diastereoselective Allylation of Diazoamides
ACS Catalysis ( IF 11.3 ) Pub Date : 2018-06-29 00:00:00 , DOI: 10.1021/acscatal.8b01687
Liang-Zhu Huang _{1,

2} , Zi Xuan ₂ , Hyun Ji Jeon ₂ , Zhen-Ting Du ₁ , Ju Hyun Kim ₃ , Sang-gi Lee ₂

Affiliation

A straightforward route toward construction of α-quaternary chiral β-lactam moiety via Rh(II)/Pd(0)-catalyzed stereoselective relay catalytic reaction is reported. This asymmetric dual relay catalysis involves Rh(II)-catalyzed enantioselective intramoluecular C–H insertions of α-diazoamides, and sequential Pd(0)-catalyzed diastereoselective intermolecular allylic alkylation. Under mild reaction conditions, a broad range of α-quaternary allylated chiral β-lactams have been synthesized in high yields (up to 99%) with excellent stereoselectivities [up to diastereomeric ratio (dr) >99:1, up to 98% enantiomeric excess (ee)].

中文翻译：

不对称的Rh（II）/ Pd（0）中继催化：重氮酰胺的对映选择性C–H插入/非对映选择性烯丙基化反应合成α-四元手性β-内酰胺

据报道，通过Rh（II）/ Pd（0）催化的立体选择性中继催化反应，可直接构建α-季手性β-内酰胺部分。这种不对称的双重中继催化涉及Rh（II）催化的α-重氮酰胺的对映选择性分子内C–H插入，以及顺序的Pd（0）催化的非对映选择性分子间烯丙基烷基化。在温和的反应条件下，已以高收率（高达99％）和优异的立体选择性合成了多种α-季烯丙基手性β-内酰胺[对映异构体比率（dr）> 99：1，对映体高达98％超额（ee）]。

更新日期：2018-06-29

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