First General Route to Substituted α-Arylamino-α′-chloropropan-2-ones by Oxidation of N-Protected Aminohalohydrins: The Importance of Disrupting Hydrogen Bond Networks
摘要:
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。
Chemoselective Synthesis of<i>N</i>-Substituted α-Amino-α′-chloro Ketones<i>via</i>Chloromethylation of Glycine-Derived Weinreb Amides
作者:Vittorio Pace、Wolfgang Holzer、Guido Verniest、Andrés R. Alcántara、Norbert De Kimpe
DOI:10.1002/adsc.201201043
日期:2013.3.25
Functionalized α‐arylamino‐α′‐chloro ketones are obtained in high yield via a straightforward homologation reaction of Weinrebamides derived from N‐arylglycines using in situ generated chloromethyllithium. The use of the Weinrebamides is essential and allows the chemoselective homologation of N‐aryl‐N‐substituted glycine analogues, a transformation which is not possible using similar glycine esters. The