1-Bromo-2-trifluoroacetylcyclobutenes as novel building blocks for the construction of trifluoromethyl substituted heterocycles. Part 2: Synthesis of trifluoromethyl substituted thiophenes, condensed with cyclobutene moieties
作者:Andrey B. Koldobskii、Nikolay P. Tsvetkov、Ekaterina V. Solodova、Valery N. Kalinin
DOI:10.1016/j.jfluchem.2010.04.007
日期:2010.8
This paper describes a novel synthetic approach to 2-cyano-3-trifluoromethylthiophenes fused with cyclobutene rings with variable spiro conjunctions. The reaction of substituted 1-bromo-2-trifluoroacetylcyclobutenes with mercaptoacetonitrile results in the substitution of bromine with S-center to afford the corresponding nitriles in high yields, which form the target thiophenes by subsequent treatment
本文描述了一种新颖的合成方法,用于2-氰基-3-三氟甲基噻吩与具有可变螺线连接的环丁烯环稠合。取代的1-溴-2-三氟乙酰基环丁烯与巯基乙腈的反应导致溴被S-中心取代,从而以高收率提供相应的腈,通过随后处理2,2,6,6-锂形成目标噻吩四甲基哌啶和乙酸酐。