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http://dx.doi.org/10.1016/S0040-4039(00)60843-2
Tetrahedron Letters
Volume 33, Issue 47, 17 November 1992, Pages 7089-7092
The synthesis of chiral 3-oxo-6-[(phenylmethoxy)-carbonyl]-2-piperazineacetic acid esters designed for the presentation of an aspartic acid side chain. A subsequent novel Friedel Crafts reaction
Timothy P. Kogan, * and Thomas E. Rawson