Transition‐Metal‐Free Reductive Functionalization of Tertiary Carboxamides and Lactams for α‐Branched Amine Synthesis
作者:Derek Yiren Ong、Dongyang Fan、Darren J. Dixon、Shunsuke Chiba
DOI:10.1002/anie.202004272
日期:2020.7.13
A new method for the synthesis of α‐branched amines by reductive functionalization of tertiary carboxamides and lactams is described. The process relies on the efficient and controlled reduction of tertiary amides by a sodium hydride/sodiumiodide composite, in situ treatment of the resulting anionic hemiaminal with trimethylsilyl chloride and subsequent coupling with nucleophilic reagents including
Reactions of 2-(Dialkylamino)arylacetonitriles with Acetylenes Under Basic Conditions. A Simple Synthesis of Substituted Mono and Diketones
作者:T. Zdrojewski、A. Jończyk
DOI:10.1055/s-1990-26839
日期:——
2-(Dialkylamino)arylacetonitriles 1 react with acetylenes 2a,b in dimethyl sulfoxide, powdered sodium hydroxide and triethylbenzylammonium chloride as a catalyst to give 3 and/or 4. The latter are formed via addition of anion 8 to immonium salt 9. The type of product formed depends on the basicity of amino moiety in 3. Furthermore, compound 1 adds to C-1 of acetylene 2c affording the vinyl derivatives 15. The products 3, 4, 11 and 15 are hydrolyzed to give ketones 5-7, 12 and 16, respectively.
Synthese β-substituierter Serin- und Isoserinnitrile
作者:Peter Tinapp
DOI:10.1002/ardp.19823150405
日期:——
Die Isoserine 4 werden ausgehend von den α‐Aminonitrilen 2 durch partielle Hydrierung mit anschließender Cyanhydrinsynthese hergestellt. Die Reaktion gelingt ohne Isolierung der intermediär gebildeten α‐Aminoaldehyde 3. Eine verbesserte Methode zur Darstellung der Serine 6 aus Glycerinsäurenitrilen wird beschrieben. Die spektroskopischen Eigenschaften von 4 und 6 werden diskutiert.
reacts with acetylene (2) in the presence of solid sodium hydroxide and tetrabutylammonium bromide (TBABr) as a catalyst, in DMSO, to give the vinyl derivative 3a. Whereas aminonitriles 1b-i, in the reaction with 2, afford dienamines 7. The different reactivity of 1a as compared to 1b-i is explained in terms of the different basicity of the amino moiety in vinyl derivatives 3. Dienamines 7 were hydrolyzed
Treatment of α-amino-α-arylacetonitriles with aldehyde arenesulfonyl hydrazones affords unsymmetrical α-aminoazines in high yields, which formed by replacement of the arenesulfonyl group of the hydrazone by the acetonitrile carbanion. The formation-mechanism of azines is also discussed.