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http://dx.doi.org/10.1055/s-2007-965881Sergey V. Ryabukhin et al. N-Substituted Ureas and Thioureas in Biginelli Reaction Promoted by Chlorotrimethylsilane: Convenient Synthesis of N1-Alkyl-, N1-Aryl-, and N1,N3-Dialkyl-3,4-Dihydropyrimidin-2(1H)-(thi)ones. Synthesis 2007(3): 417-427
thank a lot, eFO!