Synthesis of pyrimidinethiones and spiropyrans proceeding from Mannich ketones
作者:M. P. Shchekina、R. S. Tumskii、I. N. Klochkova、A. A. Anis’kov
DOI:10.1134/s107042801702021x
日期:2017.2
β-aminoketones were revealed consisting in heterocyclization reactions with the formation of spirochromenes and hydropyrimidinethiones. Alicyclic conjugated Mannich bases under conditions of basic catalysis suffer deamination followed by [4+2]-cycloaddition leading to the stereo- and regiodirected formation of difficultly available spirochromene derivatives. Three-component condensation of acyclic and alicyclic