1,1,1-Trichloro-4,4-diethoxy-3-buten-2-one and its Trichloroacetylacetate Derivatives: Synthesis and Applications in Regiospecific Preparation of Azoles
作者:Marcos A. Martins、Claudio M. Pereira、Nilo E. Zimmermann、Sidnei Moura、Adilson P. Sinhorin、Wilson Cunico、Nilo Zanatta、Helio G. Bonacorso、Alex C. Flores
DOI:10.1055/s-2003-42407
日期:——
acylation reaction of respective trialkyl orthoacetates and orthopropionates with trichloroacetyl chloride in good yields, is reported. The title compounds were used for the regiospecific preparation of two isoxazoles and five pyrazoles in the cyclocondensation with hydroxylamine and hydrazines, respectively. The transformation of the trichloromethyl group under mild conditions into carboxylic groups is also
报道了原乙酸三烷基酯和原丙酸三烷基酯与三氯乙酰氯的酰化反应以良好的收率合成 1,1,1-三氯-4,4-二乙氧基-3-丁烯-2-酮和三种三氯乙酰乙酸衍生物。标题化合物分别用于在与羟胺和肼的环缩合中区域特异性制备两种异恶唑和五种吡唑。还描述了在温和条件下将三氯甲基转化为羧基。