Silylating reagents having a group other than a divalent oxygen separating two silyl groups provide regioselective protection of reactive groups under robust conditions, such as basic conditions used in alkylation, acylation and deoxygenation. In particular, silylating reagents having a group other than oxygen separating two silyl groups are useful for protecting two hydroxy groups of a ribonucleic or deoxyribonucleic acid. Alkylation of a 2′-hydroxy group of a ribonucleoside protected with the inventive silylating agents in the presence of an excess of a mild hindered base such as sodium HMDS may be carried out without protecting the exocyclic amine and oxo functionalities of nucleobases.
具有除了双价氧以外的其他基团的
硅基化试剂,在强韧条件下提供对反应基团的区域选择性保护,例如烷基化、酰化和脱氧等碱性条件。特别是,具有除氧以外的基团分隔两个
硅基团的
硅基化试剂对于保护
核糖核酸或
脱氧核糖核酸的两个羟基是有用的。在存在过量轻微阻碍碱(如
钠HMDS)的情况下,可在创新的
硅基化试剂保护的
核糖核苷酸的2'-羟基上进行烷基化,而无需保护
嘌呤碱基的外环胺基和羟基官能团。