(GRAPHICS) An approach to the densely functionalized fluorocyclopropane 14, a key framework toward the synthesis of mGluR 2 receptor agonist MGS0028 (1) is reported. The Trost AAA reaction enantioselectively introduced the key allylic stereogenic center and the alpha-fluoroester moiety. Stereoselective epoxidation followed by intramolecular epoxide ring opening efficiently constructed the 1-fluorocyclopropane-1-carboxylate matrix. This route can potentially be a general methodology for a concise, highly enantio- and stereoselective synthesis of 1-fluorocyclopropane-1-carboxylate derivatives.
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