Regioselective synthesis of β-fluoro-α,β-unsaturated ketones by the reaction of β-diketones with DFMBA
作者:Keisuke Sano、Tsuyoshi Fukuhara、Shoji Hara
DOI:10.1016/j.jfluchem.2009.05.009
日期:2009.8
The deoxyfluorination reaction of beta-diketones with N,N-diethyl-alpha,alpha-difluoro-m-methylbenzylamine (DFMBA) gave beta-fluoro-alpha,beta-unsaturated ketones in good yields. The reaction proceeded regioselectively, and only one regioisomer was obtained from the unsymmetrical 1-aryl-1,3-diketones. The reaction is applicable to diketones with a trifluoromethyl group, obtaining good yields of 3,4,4,4-tetrafluorobutenones. We used the resulting beta-fluoro-alpha,beta-unsaturated ketones for the reaction with lithium dialkyl cuprates. (C) 2009 Elsevier B.V. All rights reserved.