Heteroaryl-<i>N</i>-difluoromethyltrimethylsilanes - Versatile Sources of Heteroaryl-<i>N</i>-difluoromethyl Anions in Reactions with Carbonyl Compounds
作者:German Bissky、Vasilij I. Staninets、Alexander A. Kolomeitsev、Gerd-Volker Röschenthaler
DOI:10.1055/s-2001-11389
日期:——
An efficient procedure for synthesizing heteroaryl-N-difluoromethyltrimethylsilanes - new nucleophilic difluoromethylene synthons - from easily available N-bromodifluoromethylated heterocycles, chlorotrimethylsilane and aluminium powder in triglyme or N-methylpyrrolidinone on a preparative scale in 71-75% isolated yield is described. Heteroaryl-N-difluoromethyltrimethylsilanes and benzaldehyde react under fluoride ion catalysis to give 1-(1,1-difluor-2-hydroxy-2-phenyl-ethyl)heteroaryls, whereas for anionic heteroaryl-N-difluoromethylation of cyclohexanone a stoichiometrical mixture of heteroaryl-N-difluoromethyltrimethylsilanes and tetramethylammonium fluoride has to be used.
描述了一种高效合成异芳基-N-二氟甲基三甲基硅烷的新核亲电性二氟甲基合成子的方法,该方法利用易得的N-溴二氟甲基化杂环化合物、三甲基氯硅烷和铝粉,在三甘醇或N-甲基吡咯烷酮中,以71-75%的最终产率进行制备。异芳基-N-二氟甲基三甲基硅烷和苯甲醛在氟离子催化下反应生成1-(1,1-二氟-2-羟基-2-苯基-乙基)异芳基,而对于环己酮的阴离子异芳基-N-二氟甲基化,则需要使用异芳基-N-二氟甲基三甲基硅烷和四甲基氟铵的化学计量混合物。