SIMPLE PRODUCTION METHOD OF 4H-PYRAN-4-ONE

摘要

PROBLEM TO BE SOLVED: To provide a method for synthesizes 4H-pyran-4-one in large quantity. SOLUTION: A 2,4-bis-N,N-dialkylaminomethylene acetonedicarboxylic acid dialkyl ester (III) which is synthesized by condensation of an acetonedicarboxylic acid dialkyl ester (I) and an N,N-dialkylformamido dialkyl acetal (II) is treated with a strong acid to give the 4H-pyran-4-one. COPYRIGHT: (C)2003,JPO