The Iridium-catalyzed enantioselective couplingreaction of vinyl azides and allylic electrophiles is presented and provides access to β-chiral carbonyl derivatives. Vinyl azide are used as acetamide enolate or acetonitrile carbanion surrogates, leading to γ,δ-unsaturated β-substituted amides as well as nitriles with excellent enantiomeric excess. The products are readily transformed into chiral N-containing
Expedient Dual Co/Organophotoredox Catalyzed Stereoselective Synthesis of All‐Carbon Quaternary Centers
作者:Àlex Cristòfol、Bart Limburg、Arjan W. Kleij
DOI:10.1002/anie.202103479
日期:2021.7.5
An efficient and attractive Co/organophotoredox dualcatalysis protocol has been developed allowing the stereoselective access to a wide variety of syn-configured 1,3-diols featuring quaternary carbon centers. The synthesis of the target molecules is achieved under ambient reaction conditions using modular and accessible reagents, substituted vinyl cyclic carbonates and aldehydes, and in short reaction
Cobalt-Catalyzed Diastereo- and Enantioselective Reductive Allyl Additions to Aldehydes with Allylic Alcohol Derivatives via Allyl Radical Intermediates
enantioenriched homoallylic alcohols with a remarkably broad scope of allyl groups that can be introduced. Mechanistic studies indicated that allyl radical intermediates were involved in this process. These new discoveries establish a new strategy for development of enantioselective transformations through capture of radicals by chiral Co complexes, pushing forward the frontier of Co complexes for enantioselective
The first molybdenum-catalyzedallylic sulfonylation of tertiary allylic electrophiles is described. The method employs a readily accessible catalyst (Mo(CO)6/2,2′-bipyridine, both are commercially available) and represents the first example of the use of a group 6 transition metal-catalyst for allylic sulfonylation of substituted tertiary allylic electrophiles to form carbon–sulfur bonds. This atom
Regio- and Enantioselective Allylic Alkylation of Terminal Alkynes by Synergistic Rh/Cu Catalysis
作者:Wen-Yu Huang、Chun-Hua Lu、Samir Ghorai、Bing Li、Changkun Li
DOI:10.1021/jacs.0c08283
日期:2020.9.9
A highly branch- and enantioselective 1,4-enynes synthesis from readily available terminalalkynes and racemic allylic carbonates by Sonogashira type synergistic Rh and Cu catalysis under neutral conditions has been developed. Aliphatic and aromatic terminalalkynes with various functional groups could be used directly. An inner-sphere reductive elimination C(sp)-C(sp3) bond formation mechanism is
在中性条件下,Sonogashira 型协同 Rh 和 Cu 催化从容易获得的末端炔烃和外消旋烯丙基碳酸酯合成高度支化和对映选择性的 1,4-烯炔。可以直接使用具有各种官能团的脂肪族和芳香族末端炔烃。化学计量反应支持内球体还原消除 C(sp)-C(sp3) 键形成机制。