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 trichloromethylgroup under mild conditions into carboxylic groups is also