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KG-60-piperazine as an efficient heterogeneous catalyst for three-component synthesis of 2-amino-2H-chromenes

✍ Scribed by Golari, Neda; Rahimizadeh, Mohammad; Bakavoli, Mehdi; Rezaei-Seresht, Esmail


Book ID
124074819
Publisher
Springer Netherlands
Year
2014
Tongue
English
Weight
618 KB
Volume
41
Category
Article
ISSN
0922-6168

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## Abstract Fluoroboric acid supported on silica gel (HBF~4~‐SiO~2~) catalyzes efficiently the three component condensation of an aldehyde, a 1,3‐dicarbonyl compound and urea or thiourea to afford the corresponding 3,4‐dihydropyrimidin‐ 2(1__H__)‐ones and thiones in high yields. The ambient conditi