Practical synthesis of Boc and Fmoc protected 4-fluoro and 4-difluoroprolines from trans-4-hydroxyproline
Luc Demange,
André Ménez,
Christophe Dugave
Tetrahedron Letters
Volume 39, Issue 10, 5 March 1998, Pages 1169–1172
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http://dx.doi.org/10.1016/S0040-4039(97)10793-6