作者:Michael Marhold、Anna Buer、Henk Hiemstra、Jan H. van Maarseveen、Günter Haufe
DOI:10.1016/j.tetlet.2003.10.127
日期:2004.1
The first ring-closing olefin metatheses of alkenyl alpha-fluoracrylamides or acrylates incorporating a fluorinated double bond are reported. Several N-benzyl-N-alkenyl-alpha-fluoroacrylamides were cyclized in the presence of 2 mol % of Grubbs II catalyst at room temperature to form an unsaturated gamma-lactam, and at 80degreesC to form the corresponding delta-lactams bearing a fluoro vinyl moiety. At elevated temperature, cyclization of an N-methallyl 2-fluoroacrylamide to form a fluorinated, tetrasubstituted double bond was achieved. Similarly, 3-fluorocoumarin was prepared from (2-vinylphenyl)-alpha-fluoroacrylate. (C) 2003 Elsevier Ltd. All rights reserved.