An efficient multicomponent transformation of alkyl isocyanides, dialkyl acetylenedicarboxylates, and 2,4-dihydroxybenzophenones or 2,4-dihydroxyacetophenones into 2-amino-4H-chromene derivatives
摘要:
The addition of 2,4-dihydroxybenzophenones or 2,4-dihydroxyacetophenones to dialkyl acetylenedicarboxylates under neutral conditions in the presence of alkyl isocyanides leads to 2-amino-4H-chromene derivatives in high yields.