Create reagents that chemically modify a portion of a molecle without protecting. And later having to deprotect, other reactive sites on the molecule that we do not want to modify.

• 合成能够只对分子的一部分进行选择性反应的化合物,从而不必在反应前先对分子中不想改变的活性位点进行保护并在反应后去保护。