设计用于交叉偶联的新配体对于开发获得有价值产品(如药物)的新催化反应至关重要。在本报告中,我们利用含腈添加剂在 Ni 催化中的反应性来设计含苄腈的配体,用于涉及三级亲核试剂的交叉偶联。动力学和哈米特研究用于阐明优化配体的作用,这表明苄腈部分充当电子受体,以促进还原消除而不是 β-氢化物消除并稳定低价镍。在这些条件下,进行了脱氰-金属化和镍催化芳基化的方案,从而能够从双取代丙二腈中获得四元 α-芳基腈。
A one-pot electrophilic cyanation–functionalization strategy for the synthesis of disubstituted malononitriles
作者:L. Reginald Mills、Sophie A.L. Rousseaux
DOI:10.1016/j.tet.2019.05.004
日期:2019.8
Malononitriles are valuable synthetic intermediates for many applications, including the synthesis of herbicides and other biologically active molecules, and the synthesis of chiral ligands for asymmetric catalysis. This article describes the development of a procedure for the conversion of primary nitriles to malononitriles using dimethylmalononitrile, a commercial, non-toxic, carbon-bound source
Decyanation–(hetero)arylation of malononitriles to access α-(hetero)arylnitriles
作者:L. Reginald Mills、Purvish Patel、Sophie A. L. Rousseaux
DOI:10.1039/d2ob00236a
日期:——
Quaternary α-(hetero)arylnitriles are desirable biologically relevant products, however the existing methods for their synthesis can be unselective or require the use of undesirable reagents, such as cyanide salts. Herein we report a one-pot method for transnitrilation-mediated decyanation–metalation of disubstituted malononitriles, followed by treatment with (hetero)aryl electrophiles to access quaternary