A mixture of trifluoroacetylthiopyridine, the sodium salt of 1-hydroxybenzotriazole, and an acylamino acid is able to acylate amino acid esters in high yields with minimal racemization and should, therefore, be useful for fragment condensation reactions in the liquid phase.
                                    三
氟乙酰基
硫代
吡啶、
1-羟基苯并三唑钠盐和酰
氨基的混合物能够高产率地酰化
氨基酸酯,且消旋化程度极低,因此可用于液相中的片段缩合反应。