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.
A mild, efficient one-pot three component strecker reaction involving electronically and structurally divergent aldehydes, amines and trimethly silyl cyanide in chloroform as solvent at room temperature was accomplished in moderate to excellent yields using an inexpensive and readily available catalyst, Zn(OAc)2.2H2O.