Helvetica Chimica Acta p. 411 - 416 (1990)
Update date:2022-08-02
Topics:
Kvita, Vratislav
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 the corresponding 2-oxo-2H-pyran-5-carboxylate derivatives.
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