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Title: Bismuth oxide perchlorate catalysed efficient synthesis of 3,4-dihydropyrimidin-2(1H)-ones: An improved high yielding protocol for the Biginelli reaction
Authors: Reddy, Y Thirupathi
Reddy, P Narsimha
Kumar, B Sunil
Rao, G V P
Rajitha, B
Issue Date: Jun-2005
Publisher: CSIR
IPC Code: Int.Cl.7 C 07 D 239/00
Abstract: Dihydropyrimidines are prepared by a one-pot cyclo­con­densation of aldehydes, β-ketoesters and urea in acetonitrile by using bismuth oxide perchlorate as the catalyst for the first time is described. Compared to the classical Biginelli reaction conditions, this new method consistently has the advantage of excellent yields (85-95%) and short reaction time (2-4 hr) at lower temperature (40-50oC).
Page(s): 1304-1306
ISSN: 0975-0983(Online); 0376-4699(Print)
Appears in Collections:IJC-B Vol.44B(06) [June 2005]

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