Zirconium cation coordination in the borohydride-mediated synthesis of β-hydroxy-N-alkoxylamines
作者:David R Williams、John W Benbow、Thomas R Sattleberg、David C Ihle
DOI:10.1016/s0040-4039(01)01862-7
日期:2001.12
Hydride reductions of oxime ethers to hydroxylamine derivatives are facilitated by the participation of neighboring hydroxyl groups. Precomplexation with zirconium cation in ether–methylene chloride solutions is effective for selective CN bond reduction. The course for stereochemical control is dictated by Lewis acid coordination complexes of E- and Z-oximino ethers which lead to the preferred diastereofacial
邻近羟基的参与促进了肟醚的氢化物还原为羟胺衍生物。在乙醚-二氯甲烷溶液中与锆阳离子进行预络合可有效地选择性还原CN键。立体化学控制的过程由E-和Z-肟基醚的路易斯酸配位配合物决定,这导致优选的非对映体外部氢化物传递。