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。