作者:Deborah Stanford (nee Sinnott)、Andrew V. Stachulski
DOI:10.1016/j.tetlet.2007.01.127
日期:2007.3
acid derivatives is the base-catalysed elimination of a 4-(substituted) hydroxy group to generate a Δ4,5 pyranose. Following hydrogenation, proceeding mainly from the α-face provided the anomeric configuration is β, the initial C(5)-configuration is restored. This sequence affords access to a number of 4-deoxypyranoses: thus 4-deoxyglucoses are readily available by reduction at C(6). Conversion to a
一个葡糖醛酸衍生物的特征的反应是4-(取代的)羟基的碱催化的消除,以生成Δ 4,5吡喃糖。氢化后,主要从α面开始,只要端基异构体构型为β,即可恢复初始C(5)构型。该序列提供了进入多个4-脱氧吡喃糖的途径:因此,通过在C(6)还原可容易地获得4-脱氧葡萄糖。转换为糖基,然后在C(2)/ C(3)处进行顺二羟基化反应,形成d- lyxo构型(在新霉素中发现)。最后,再次通过二羟基化显示出与KDO系列的不太明显的关系。