Novel Synthesis of Acylaminomethylene Meldrum's Acids and Their Thermolysis to 4-Methylthio-and 4-Amino-2-aryl-6H-1,3-oxazin-6-ones
摘要:
Bismethylthiomethylene Meldrum's acid reacts with amides in the presence of potassium hydroxide to afford methylthioacylaminomethylene Meldrum's acid 5. Aminolysis of 5 gives aminoacylaminomethylene Meldrum's acids 7. Thermolysis of 5 and 7 supplies a novel synthetic method of 4-methylthio- and 4-amino-2-aryl-6H-1,3-oxazin-6-ones.