The asymmetric synthesis of α-amino acids via the addition of grignard reagents to imine derivatives.
作者:David P.G. Hamon、Ralph A. Massy-Westropp、Pasquale Razzino
DOI:10.1016/s0040-4020(01)90125-5
日期:1992.1
ester-8-phenylmenthyl N-Boc-glycinate 5a, undergoes free radical bromination by N-bromosuccinimide to give 8-phenylmenthyl N-Boc-bromoglycinate 8. Treatment of the bromide 8 with a variety of Grignard reagents at low temperature gave 8-phenylmenthyl (S-N-Boc-2-alkylglycinates with high diastereoselectivity. Conditions were found for the hydrolysis of these derivatives with no racemization of the resultant
酯-8-苯基薄荷基N -Boc-甘氨酸酸酯5a通过N-溴琥珀酰亚胺进行自由基溴化,得到8-苯基薄荷基N -Boc-溴甘氨酸酸酯8。在低温下用各种格氏试剂对溴化物8进行处理,得到了具有高非对映选择性的8-苯基薄荷基(S - N -Boc-2-烷基甘氨酸),发现了水解这些衍生物的条件,而得到的氨基酸没有外消旋化。