undergo smooth OsO4-catalyzed cis-hydroxylation to give amino-polyol precursors. The reaction is ‘anti’-selective, the diastereoisomeric ratios ranging from 73:27 up to ≥ 99:1. Thus, the cycloaddition/osmylation sequence allows the control of the relative configuration of up to four contiguous asymmetric centers. A sulfoxide-mediated approach to enantiomerically pure compounds is also described.
通过将腈的氧化物区域和立体有择地环加成二烯而获得的各种取代的4,
5-二氢-5-
乙烯基异恶唑经历OsO 4催化的顺式顺式羟基化反应,得到
氨基多元醇前体。该反应是“反”选择性的,非对映异构体比例为73:27至≥99:1。因此,环加成/甲磺酰化序列允许控制多达四个连续的不对称中心的相对构型。还描述了亚砜介导的对映体纯化合物的方法。