Elongation of the pentose chain at the terminal carbon atom with Grignard C1 reagents. A study of the homologation reaction
作者:Halszka Stępowska、Aleksander Zamojski
DOI:10.1016/s0040-4020(99)00197-0
日期:1999.4
with four Grignard C1 reagents: methoxymethyl-, allyloxymethyl-, benzyloxymethyl, and dimethylphenylsilylmethyl-magnesium chlorides. Derivatives of the expected stereoisomeric hexoses were accompanied in some cases by C-4 inverted products. The results have been discussed in terms of α- and β-chelated transition states. It has been found that the RX (X=O,Si) grouping of the Grignard reagent strongly
使四种立体异构的戊二醛-1,4-呋喃糖酶的衍生物与四种Grignard C 1试剂:甲氧基甲基-,烯丙氧基甲基-,苄氧基甲基和二甲基苯基甲硅烷基甲基-氯化镁反应。预期的立体异构己糖的衍生物在某些情况下还伴有C-4反向产物。已经根据α-和β-螯合的过渡态讨论了结果。已经发现格氏试剂的RX(X = O,Si)分组强烈影响延伸反应的立体化学结果。