The invention relates to novel substituted 1H-pyrrole-2,5-diones of the formula (IA)
in which A′, Ar′ and R′ are as defined in the description, to novel compositions for controlling animal pests based on substituted 1H-pyrrole-2,5-diones of the formulae (I) and (IA)
in which A, A′, Ar, Ar′, R and R′ are as defined in the description, and to processes for their preparation.
The synthesis of 5-ylidenepyrrol-2(5H)-ones from maleimides and from pyrrol-2-(5H)-ones
作者:G. Bryon Gill、Gwyn D. James、Karen V. Oates、Gerald Pattenden
DOI:10.1039/p19930002567
日期:——
However, the lithium enolate of methyl trimethylsilylacetate (or other Peterson-type reagents) underwent successful addition to N-methylmaleimides at –78 °C; the 5-ylidenepyrrolone product distributions were similar to those obtained with the stabilised phosphoranes. Variation of the 5-alkylidene side-chain was achieved through the reactions of N-methylmaleimides with alkyl Grignardreagents by dehydrating-the