Organocatalytic Enantioselective Strecker Synthesis of α-Quaternary α-Trifluoromethyl Amino Acids
作者:Dieter Enders、Katharina Gottfried、Gerhard Raabe
DOI:10.1002/adsc.201000666
日期:2010.12.17
The first organocatalytic enantioselective Strecker synthesis of α-quaternary α-trifluoromethylated amino acids has been developed. Employing Takemoto’s thiourea catalyst the nucleophilic addition of trimethylsilyl cyanide to trifluoromethyl ketimines affords α-amino nitriles in good to excellent yields (50–99%) and very good enantioselectivities (ee=83–95%). The enantiopure amino nitriles can be obtained
已经开发了α-季α-三氟甲基化氨基酸的第一有机催化对映选择性Strecker合成。使用竹本的硫脲催化剂,将三甲基甲硅烷基氰化物亲核加成到三氟甲基酮亚胺上,可以得到很好的产率(50-99%)和非常好的对映选择性(ee = 83-95%)的α-氨基腈。对映纯氨基腈可通过重结晶获得。脱保护和水解产生标题氨基酸。