2,3-Dicyclohexylsuccinimide as a directing/protecting group for the regioselective glycosylation or alkylation of purines
作者:Ayan Pal、Kerry J. Salandria、Joseph W. Arico、Mark K. Schlegel、Larry W. McLaughlin
DOI:10.1039/c3cc37265k
日期:——
Here we describe the synthesis and application of a novel 2,3-dicyclohexylsuccinimide (Cy2SI) protecting group towards regioselective purine glycosylation and alkylation reactions. This bulky protecting group promotes high regioselectivity during the glycosylation (as well as diastereoselectivity) or alkylation of purines using Hoffer's chlorosugar or tert-butyl bromoacetate, respectively. Cy2SI offers the additional synthetic advantage that other base-labile protecting groups, such as toluoyl esters, can be selectively removed in its presence without affecting the imide.
在此,我们介绍了一种新型 2,3-二环己基琥珀酰亚胺(Cy2SI)保护基团的合成及其在区域选择性嘌呤糖基化和烷基化反应中的应用。在分别使用 Hoffer's 氯糖或溴乙酸叔丁酯对嘌呤进行糖基化(以及非对映选择性)或烷基化反应时,这种笨重的保护基团可提高区域选择性。Cy2SI 还具有额外的合成优势,即在其存在下可选择性地去除甲苯甲酰酯等其他碱基不敏感的保护基团,而不会影响亚胺。