Tetrahedron Letters p. 1341 - 1344 (1999)
Update date:2022-08-12
Topics:
Kobayashi
Furuta
Sugita
Okitsu
Oyamada
Polymer-supported acylhydrazones, prepared from polystyrene resin (1%divinylbenzene), reacted with ketene silyl acetals in the presence of a catalytic amount of scandium triflate (Sc(OTf)3), to afford the corresponding β-hydrazinoesters, which were cyclized and cleaved from the support simultaneously by treatment with a base to produce diverse pyrazolone derivatives.
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