%0 Journal Article %T Synthesis of (2R,3S)-((1R,2S,5R)-2-isopropyl-5-methylcyclohexyl) 2-(4-bromophenyl)-3-(tert-butoxy-carbonylamino)-tetrahydrofuran-3-carboxylate and (2S,3R)-((1R,2S,5R)-2-isopropyl- 5-methylcyclohexyl)2-(4- bromophenyl)-3-(tert-butoxy£¿carbonyl£¿amino)-tetrahydrofuran-3-carboxylate %A Andreas Grauer %A Burkhard K£¿nig %J Molbank %D 2009 %I MDPI AG %R 10.3390/m594 %X Two new C¦Á-tetrasubstituted ¦Á-amino acids (2R,3S)-((1R,2S,5R)-2-isopropyl-5-methylcyclohexyl) 2-(4-bromophenyl)-3-(tert-butoxycarbonylamino)-tetrahydrofuran-3-carboxylate and (2S,3R)-((1R,2S,5R)-2-isopropyl-5-methylcyclohexyl) 2-(4-bromophenyl)-3-(tert-butoxycarbonylamino)-tetrahydrofuran-3-carboxylate were synthesized and characterized by NMR, MS, elemental analysis and X-ray. %K amino acid synthesis %K C¦Á-tetrasubstituted ¦Á-amino acids %K unnatural amino acids %U http://www.mdpi.com/1422-8599/2009/1/M594