Regioselective Conversion of Primary Alcohols into Iodides in Unprotected Methyl Furanosides and Pyranosides
作者:Robert Madsen、Philip R. Skaanderup、Carina Storm Poulsen、Lene Hyldtoft、Malene R. Jørgensen
DOI:10.1055/s-2002-33641
日期:——
the primary hydroxy group in methyl glycosides with iodide. The first method is a modification of a literature procedure employing triphenylphosphine and iodine, where purification has been carried out on a reverse phase column in order to efficiently separate the desired iodoglycosides from triphenylphosphine oxide. The second method employs a new procedure using sulfonylation in pyridine with sterically
描述了用碘化物对甲基糖苷中的伯羟基进行区域选择性置换的两种方法。第一种方法是使用三苯膦和碘对文献程序的改进,其中纯化在反相柱上进行,以便有效地从三苯膦氧化物中分离出所需的碘苷。第二种方法采用了一种新的方法,即在吡啶中用空间位阻的 2,4,6-三氯和 2,4,6-三溴苯磺酰氯进行磺酰化。如此形成的磺酸盐是有效的离去基团,并且可以在一锅法中进行碘化物的取代。碘苷的保护也描述为用三氯乙酰亚胺苄酯苄基化或用三乙基甲硅烷基氯甲硅烷基化。