Heterocyclizations of functionalized heterocumulenes with C,N-, C,O-, and C,S-binucleophiles: XII. Synthesis of alkyl 3-aryl-1,5-dioxo-2,3,5,6-tetrahydro-1H-pyrimido-[1,6-a]quinoxaline-4-carboxylates
摘要:
Alkyl 3-oxo-1,2,3,4-tetrahydroquinoxalin-2-ylideneacetates reacted with alpha-chlorobenzyl isocyanates to give alkyl 3-aryl-1,5-dioxo-2,3,5,6-tetrahydro-1H-pyrimido[1,6-a]quinoxaline-4-carboxylates.