An efficient synthesis of uracil derivatives from 2-alkyl-Δ2-oxazolines and nitriles
摘要:
An efficient a rid convenient synthesis of new fluorinated a rid non-fluorinated uracils is described herein. The condensation of nitriles with enolates generated from 2-alkyl-Delta(2)-oxazolines affords fluorinated beta-enamino acid derivatives, which react with triphosgene to give an isomeric mixture of oxazolopyrimidinones. These can then be easily transformed into a single C-6 pyrimidindione derivative through reaction with a suitable nucleophile. (c) 2008 Elsevier B.V. All rights reserved.
Synthesis and C-alkylation of C-protected β-enamino acid derivatives from oxa- thia- and imidazolines
摘要:
Various heterocycles 3a-h can be readily metallated and condensed with a variety of organic nitriles to afford C-protected beta-enamino acid derivatives 1 (or 2). Procedures for alkylation of compounds 1 to obtain 2 as well as a "one-pot" preparation of 2 from 3 are also described. (C) 1999 Elsevier Science Ltd. All rights reserved.