ChemInform Abstract: An Easy Route to 2‐Substituted‐2,3‐dihydro‐5(7)H‐oxazolo[3,2‐a]pyrimidin‐5‐ones and 7‐ones Starting from the Corresponding 2‐Amino‐2‐oxazolines.

Abstract

An Easy Route to 2-Substituted-2,3-dihydro-5(7)H-oxazolo[3,2a]pyrimidin-5-ones and 7-ones Starting from the Corresponding 2-Amino-2-oxazolines. -The one-step ring anellation of aminooxazolines (I) with acetylenic esters (II) or diketene (V) as potent biselectrophiles yielding the regioisomeric pyrimidones (III) and (VI) is described. -(FORFAR, I.; GUILLON, J.; MASSIP, S.; LEGER, J.-M.; FAYET, J.-P.; JARRY, C.; J.