An easy strategy for the synthesis of 5-phosphorylated pyrimidin-2,4-diones from β-phosphine oxide and phosphonate enamines
作者:Francisco Palacios、Domitila Aparicio、Ana M Ochoa de Retana、Jesús M de los Santos、Jesús García、Julen Oyarzabal
DOI:10.1016/s0040-4020(99)00069-1
日期:1999.3
An easy and efficient synthesis of pyrimidin-2,4-diones substituted with a phosphine oxide or phosphonate group in the 5-position is described. The key step is the cyclization of functionalized amides, with ethyl chloroformate in the presence of base. In the same way, functionalized thioamides afforded substituted 5-phosphorylated 2-oxo-pyrimidin-4-thiones.