SOLID-PHASE SYNTHESIS OF POLYMER-BOUND β-KETOESTERS AND THEIR APPLICATION IN THE SYNTHESIS OF STRUCTURALLY DIVERSE PYRAZOLONES
摘要:
An efficient solid-phase synthesis of different polymer-bound beta-ketoesters 7 is described using readily available acid chlorides I and haloalkanes 6 as building blocks. The corresponding pyrazolones 9 and 10 were obtained by mild acid catalyzed reaction with phenylhydrazine or by treatment with hydrazine under cyclisation and cleavage from the resin in high purity and good yield. (C) 1997 Elsevier Science Ltd.
We report a solid-phase synthesis of 3-acyltetramic acids that are components of naturally occurring antibiotics. The products were obtained in satisfactory purity by a novel cyclization-cleavage strategy via a Dieckmann condensation.
SOLID-PHASE SYNTHESIS OF POLYMER-BOUND β-KETOESTERS AND THEIR APPLICATION IN THE SYNTHESIS OF STRUCTURALLY DIVERSE PYRAZOLONES
作者:Lutz F Tietze、Adrian Steinmetz、Friedhelm Balkenhohl
DOI:10.1016/s0960-894x(97)00209-6
日期:1997.5
An efficient solid-phase synthesis of different polymer-bound beta-ketoesters 7 is described using readily available acid chlorides I and haloalkanes 6 as building blocks. The corresponding pyrazolones 9 and 10 were obtained by mild acid catalyzed reaction with phenylhydrazine or by treatment with hydrazine under cyclisation and cleavage from the resin in high purity and good yield. (C) 1997 Elsevier Science Ltd.
Mohri, Kunihiko; Oikawa, Yuji; Hirao, Ken-ichi, Chemical and pharmaceutical bulletin, 1982, vol. 30, # 9, p. 3097 - 3105