Concept-Driven Chemoselective O/N-Derivatization of Prolinol: A Bee-Line Approach to Access Organocatalysts
作者:Jigyansa Sahoo、Jeetendra Panda、Santanab Giri、Gokarneswar Sahoo
DOI:10.1021/acs.joc.3c00992
日期:2023.7.21
a highly utilized protocol has been reported, wherein the mono-Boc functionalization of prolinol could be controlled for the exclusive synthesis of either N-Boc, O-Boc, or oxazolidinone derivatives. Mechanistic investigation revealed that the elementary steps could possibly be controlled by (a) a requisite base to recognize the differently acidic sites (NH and OH) for the formation of the conjugate
已报道了对反应条件对高度利用的方案的敏感性的研究,其中可以控制脯氨醇的单 Boc 官能化以专门合成N -Boc、O -Boc 或恶唑烷酮衍生物。机理研究表明,基本步骤可能由以下因素控制:(a)识别不同酸性位点(NH和OH)所需的碱,以形成与亲电子试剂反应的共轭碱,以及(b)缀合物碱性位点的亲核性。在此,报道了通过使用合适的碱对脯氨醇的亲核位点进行成功的化学选择性功能化。这是通过利用 NH 和 OH 的相对酸度差异以及相应共轭碱基 N -和 O -的反向亲核性来实现的。该方案也已用于合成几种O-功能化脯氨醇衍生的有机催化剂,其中很少有新报道。