Reaction of .BETA.-aminocrotonamide with N-acylated amino acid esters to give 2-acylaminoalkyl-6-methylpyrimidin-4(3H)-ones and their ring closure with polyphosphoric acid (PPA).
1983 ◽
Vol 31
(7)
◽
pp. 2288-2295
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2013 ◽
Vol 17
(17)
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pp. 1903-1909
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