N-(2-Nitrophenylsulfonyl)- (o-NBS-AA-OMe, 4) and N-(4-Nitrophenylsulfonyl)-α-amino acid methyl esters (p-NBS-AA-OMe, 5) were N-alkylated with a variety of alkyl halides 6 under solid-liquid phase-transfer catalysis (SL-PTC) conditions, affording the alkylated products o-NBS-N-R2-AA-OMe 7 and p-NBS-N-R2-AA-OMe 8 in excellent yields without any detectable racemization.
N-(2-
硝基苯磺酰基)-(o-
NBS-
AA-OMe, 4) 和 N-(4-
硝基苯磺酰基)-
α-氨基酸甲酯 (p-
NBS-
AA-OMe, 5) 用多种烷基卤化物 6 在固液相转移催化 (SL-
PTC) 条件下,得到烷基化产物 o-
NBS-N-R2-
AA-OMe 7 和 p-
NBS-N-R2-
AA-OMe 8在没有任何可检测到的外消旋化的情况下以优异的产量获得