Regioselective nitration of Nα,N1-bis(trifluoroacetyl)-l-tryptophan methyl ester: Efficient synthesis of 2-nitro and 6-nitro-N-trifluoroacetyl-l-tryptophan methyl ester
作者:Andrew S. Osborne、Phanneth Som、Jessica L. Metcalf、Robert S. Phillips
DOI:10.1016/j.bmcl.2008.09.086
日期:2008.11
Nitration of N(alpha),N(1)-bis(trifluoroacetyl)-l-tryptophan methyl ester with HNO(3) in acetic anhydride at 0 degrees C provides N(alpha)-trifluoroacetyl-2-nitro-l-tryptophan methyl ester in 67% yield, whereas nitration in trifluoroacetic acid at 0 degrees C gives N(alpha)-trifluoroacetyl-6-nitro-l-tryptophan methyl ester in 69% yield.
在0℃下,在乙酸酐中将Nα,N(1)-双(三氟乙酰基)-1-色氨酸甲酯与HNO(3)硝化,得到Nα-三氟乙酰基-2-硝基-1-色氨酸甲基酯的收率为67%,而在三氟乙酸中在0℃下硝化得到的Nα-三氟乙酰基-6-硝基-1-色氨酸甲酯的收率为69%。