New Protected Protecting Groups for the 5′-Hydroxy Group of Deoxynucleosides by Use of 2-(Hydroxymethyl)- and 2-[(Methylamino)methyl]benzoyl Skeletons and Oxidatively Cleavable Tritylthio and (4-Methoxytrityl)thio Groups
作者:Kohji Seio、Eri Utagawa、Mitsuo Sekine
DOI:10.1002/hlca.200490207
日期:2004.9
The new protecting groups 1a,b and 2a,b were developed for the 5′-OH group of deoxynucleosides by utilizing the unique characters of the sulfenate and sulfenamide linkage. These new protecting groups have a 2-(hydroxymethyl)benzoyl or 2-[(methylamino)methyl]benzoyl skeleton whose hydroxy O-atom or amino N-atom was blocked with a tritylthio-type substituent. They are removable by intramolecular cyclization
利用亚磺酸盐和亚磺酰胺键的独特特征,为脱氧核苷的5'-OH基团开发了新的保护基1a,b和2a,b。这些新的保护基具有2-(羟甲基)苯甲酰基或2-[((甲基氨基)甲基]苯甲酰基]骨架,其羟基O-原子或氨基N-原子被三苯硫基型取代基封闭。在轻度氧化条件下,三苯硫基型取代基的氧化水解后,通过分子内环化可将它们除去(方案3和6)。其中,2-[((4-甲氧基三苯甲基)亚磺酰基]氧基}甲基}苯甲酰基(MOB; 2b发现)对于保护脱氧核苷的5'-OH功能是最优选的。可以在各种脱氧核苷的5'-OH基团处引入MOB而无需保护3'-OH官能团(方案5)。通过四胸苷酸的固相合成(方案8)证明了MOB基团无需酸处理即可用于新的寡脱氧核苷酸合成方案。