TheKnoevenagel reaction of malononitrile with some cyclic ?-ketocarbothionic acid anilides synthesis of cycloalkeno-pyridines and cycloalkeno-thiopyrans
Regioselective Synthesis of Fully Substituted Fused Pyrroles through an Oxidant-Free Multicomponent Reaction
作者:Konstantinos Afratis、Joseph M. Bateman、Benjamin F. Rahemtulla、Oliver Hughes、Benjamin C. Milgram、Thomas A. Mulhern、Eric P. A. Talbot
DOI:10.1021/acs.orglett.2c03889
日期:2023.1.27
The synthesis of fully substituted fused pyrroles through a multicomponentreaction between a thioamide, an aldehyde, and ammonium acetate is described. This process improves on a route commonly employed in the patent literature by avoiding the use of potentially hazardous oxidants, which cause the formation of side products and require a stringent process of derisking to be utilized on scale. The
The tandem Michael addition-cyclization of 2-oxo-cycloalkane carbothioic acid anilides 1-3 to benzylidenemalononitrile 4 yielded spiroannulated pyridines 5-7. Reaction of acrylonitrile with 2 and 3 gave 2,2-disubstituted Michael adducts 14, 15, whereas with 1 led to 2,2,5-tri(2-cyanoethyl)-cyclopentanone 11.
BOGDANOWICZ-SZWED, K., MONATSH. CHEM., 1982, 113, N 5, 583-592