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3830640 
Journal Article 
Microwave Assisted Synthesis of Coumarin[3,4-c] Six-membered Heterocyclic Derivatives via 1,4-Michael Addition Reaction 
Yan, S; Lin, Jun 
2010 
1 
Youji Huaxue / Chinese Journal of Organic Chemistry
ISSN: 0253-2786 
30 
3 
465-468 
WOS:000276472100023 
A series of coumarin[3,4-c] six-membered heterocyclic derivatives were synthesized via 1,4-Michael addition, condensation and aromatization of coumarin and heterocyclic ketene aminals catalyzed by potassium hexamethyldisilazane (KHMDS) in dioxane under microwave irradiation. The reactions were completed in 20 min with 60%similar to 87% yields, easy work-up and short reaction time. 
coumarin; microwave; heterocyclic ketene aminal