Trifluoroethanol as a Metal-Free, Homogeneous, and Recyclable Medium for the Efficient One-Pot Synthesis of Dihydropyrimidones
作者:S. V. Rashmi、N. C. Sandhya、B. Raghava、M. N. Kumara、K. Mantelingu、K. S. Rangappa
DOI:10.1080/00397911.2010.525335
日期:2012.2.1
Trifluoroethanol is an efficient and recyclable medium in promoting one-pot, three-component condensation reactions of beta-ketoesters, aldehydes, and urea (or thiourea) to afford the corresponding dihydropyrimidones in good yields. This protocol does not require the use of an acid or base catalyst.
Propylphosphonic Anhydride-catalyzed Tandem Approach for Biginelli Reaction Starting from Alcohols
作者:Cigalli N. Revanna、Goravanalli M. Raghavendra、T. A. Jenifer Vijay、Kanchugarakoppal S. Rangappa、Doddamedur G. Badregowda、Kempegowda Mantelingu
DOI:10.1246/cl.130732
日期:2014.2.5
An efficient and highly convergent route to dihydropyrimidinones (DHPMs) has been developed by one-pot three-component oxidative cyclocondensation of a variety of alcohols, β-ketoesters/β-oxodithioester and urea in the presence of T3P®/DMSO. This new approach consistently has the advantage of tandem and good yields (65–88%).