Stereoselective Synthesis of Trifluoromethylated Compounds: Nucleophilic Addition of Formaldehyde <i>N</i>,<i>N</i>-Dialkylhydrazones to Trifluoromethyl Ketones
作者:Carmen Pareja、Eloísa Martín-Zamora、Rosario Fernández、José M. Lassaletta
DOI:10.1021/jo991049u
日期:1999.11.1
The nucleophilic 1,2-addition of formaldehydeN,N-dialkylhydrazones 1, 2, and 7-10 to trifluoromethyl ketones 3a-e takes place in the absence of any catalyst or promoter to afford a series of alpha-hydroxy-alpha-trifluoromethylhydrazones (4, 5, and 11-14) in good-to-excellent yields. From the several reagents studied, optimal results were achieved using 1-(methyleneamino)pyrrolidine (2) for the synthesis