Enantioselective Copper-Catalyzed Oxy-Alkynylation of Diazo Compounds
作者:Durga Prasad Hari、Jerome Waser
DOI:10.1021/jacs.7b04756
日期:2017.6.28
Enantioselective catalytic methods allowing the addition of both a nucleophile and an electrophile onto diazocompounds give a fast access into important building blocks. Herein, we report the highly enantioselective oxyalkynylation of diazocompounds using ethynylbenziodoxol-(on)e reagents and a simple copper bisoxazoline catalyst. The obtained α-benzoyloxy propargylic esters are useful building blocks
Electrophilic Vinylation of Thiols under Mild and Transition Metal‐Free Conditions
作者:Laura Castoldi、Ester Maria Di Tommaso、Marcus Reitti、Barbara Gräfen、Berit Olofsson
DOI:10.1002/anie.202002936
日期:2020.9
methodology displays high functional group tolerance and proceeds under mild and transition metal‐free conditions without the need for excess substrate or reagents. Mercaptothiazoles could be vinylated under modified conditions, resulting in opposite stereoselectivity compared to previous reactions with vinyliodonium salts. Novel VBX reagents with substituted benziodoxolonecores were prepared, and improved
Copper-Catalyzed Oxy-Alkynylation of Diazo Compounds with Hypervalent Iodine Reagents
作者:Durga Prasad Hari、Jerome Waser
DOI:10.1021/jacs.6b00278
日期:2016.2.24
Alkynes have found widespread applications in synthetic chemistry, biology, and materials sciences. In recent years, methods based on electrophilic alkynylation with hypervalent iodine reagents have made acetylene synthesis more flexible and efficient, but they lead to the formation of one equivalent of an iodoarene as side-product. Herein, a more efficient strategy involving a copper-catalyzed oxy-alkynylation
Revisiting the Urech Synthesis of Hydantoins: Direct Access to Enantiopure 1,5-Substituted Hydantoins Using Cyanobenziodoxolone
作者:Nina Declas、Franck Le Vaillant、Jerome Waser
DOI:10.1021/acs.orglett.8b03843
日期:2019.1.18
synthesis of enantiopure 1,5-substituted hydantoins was developed using a hypervalent iodine cyanation reagent (cyanobenziodoxolone, CBX) as a source of electrophilic carbon. Starting from inexpensive commercially available enantiopure protected amino acids, the method allowed the synthesis of various hydantoins without epimerization. Formation of hydantoins from dipeptides was also possible, but partial
Base‐Promoted Reaction of Phenols with Spirocylic λ
<sup>3</sup>
‐Iodanes: Access to Both 2‐Iodovinyl Aryl Ethers and Diaryl Ethers
作者:Shun‐Dong He、Xiao‐Qiang Guo、Jun Li、Yu‐Cheng Zhang、Lian‐Mei Chen、Tai‐Ran Kang
DOI:10.1002/ejoc.202200516
日期:2022.7.14
An efficient method for vinyl or aryl C(sp2)−O bond formation to construct both (Z)-2-iodovinyl aryl ethers and diaryl ethers through a reactivity between spiro-EBXs and phenols under metal-, photocatalyst- and light-free conditions has been developed.
一种有效的乙烯基或芳基 C(sp 2 )-O 键形成方法,通过螺-EBX 和酚在金属、光催化剂和无光下的反应性构建 ( Z )-2-碘乙烯基芳基醚和二芳基醚条件已经形成。