General and Practical Formation of Thiocyanates from Thiols
作者:Reto Frei、Thibaut Courant、Matthew D. Wodrich、Jerome Waser
DOI:10.1002/chem.201406171
日期:2015.2.2
A new method for the cyanation of thiols and disulfides using cyanobenziodoxol(on)e hypervalent iodine reagents is described. Both aliphatic and aromatic thiocyanates can be accessed in good yields in a few minutes at room temperature starting from a broad range of thiols with high chemioselectivity. The complete conversion of disulfides to thiocyanates was also possible. Preliminary computational
Mechanistic Insights into C(sp
<sup>2</sup>
)−C(sp)N Reductive Elimination from Gold(III) Cyanide Complexes
作者:Alexandre Genoux、Jorge A. González、Estíbaliz Merino、Cristina Nevado
DOI:10.1002/anie.202005731
日期:2020.10.5
elimination for the overall C(sp2)−C(sp)Nbond forming reaction is characterized herein, for the first time, complementing previous studies reported for C(sp3)−C(sp3), C(sp2)−C(sp2), and C(sp3)−C(sp2) bondformation processes taking place on gold(III) species.
已制备了新的膦连接的二氰基芳基金(III)配合物家族,并已详细研究了它们对还原消除的反应性。激活的高度正熵和主要的12/13 C KIE都表明后期的过渡过渡态,而Hammett分析和DFT计算表明该过程是异步的。结果,本文首次表征了涉及整个C(sp 2)-C(sp)N键形成反应的异步协同还原消除的独特机制,是对先前报道的C(sp 3)-研究的补充C(sp 3),C(sp 2)-C(sp 2)和C(sp 3)-C(sp 2)在金(III)物种上发生的键形成过程。
Enantioselective Synthesis of Homoallylic Azides and Nitriles via Palladium-Catalyzed Decarboxylative Allylation
作者:Maria Victoria Vita、Paola Caramenti、Jerome Waser
DOI:10.1021/acs.orglett.5b03002
日期:2015.12.4
Azides and nitriles are important building blocks for the synthesis of nitrogen-containing bioactive compounds. The first example of enantioselectivepalladium-catalyzeddecarboxylativeallylation of α-azido and cyano β-ketoesters is reported. Indanone derivatives were obtained in 50–88% yield/77–97% ee and 46–98% yield/78–93% ee for azide and nitrile substituents, respectively. The required starting
Electrophilic cyanating agent C1 accomplishes the direct cyanation of β-keto esters and amides without any catalyst and base.
电亲电性氰化试剂C1实现了β-酮酯和酰胺的直接氰化,无需任何催化剂和碱。
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