The presence of a network of intra- and intermolecular hydrogen bonds in β-arylamino alcohols, confirmed by both IR spectroscopy and computer modeling, inhibits their oxidation to the corresponding α-amino ketones. A straightforward protocol, including highly regioselective protection (as carbamates) and subsequent oxidation with Dess-Martin periodinane, affords near quantitative yields of the desired N-protected ketones, which upon mild treatment with iodotrimethylsilane leads to a series of differently functionalized α-arylamino-α′-chloro ketones.
通过红外光谱和计算机建模证实,δ-芳香族
氨基醇中存在分子内和分子间氢键网络,这抑制了它们氧化成相应的δ-
氨基酮。一个简单的方案,包括高区域选择性保护(作为
氨基甲酸酯)和随后的 Dess-Martin 高
碘烷氧化,可得到接近定量产率的所需 N 保护酮,用
碘三甲基
硅烷温和处理后,可得到一系列不同官能化的δ-±-芳基
氨基-δ′-
氯酮。