Vratislav Kvitu
Mar 14, 1990
Citations
0
Influential Citations
11
Citations
Journal
Helvetica Chimica Acta
Abstract
Synthesis of 2-Oxo-2H-pyran-5-carboxylate Derivatives 3-Substituted diethyl pent-2-enedioates are easily formylated by means of ethyl formate/TiCl4/4-methylmorpholine to produce the ethoxymethylene derivatives, which are smoothly cyclized either with HCOOH or PPA to corresponding 2-oxo-2H-pyran-5-carboxylate derivatives.