Synthesis of polysubstituted 3-hydroxypyridines via the revisited hetero-Diels–Alder reaction of 5-alkoxyoxazoles with dienophiles
作者:Cyrille Sabot、Emilia Oueis、Xavier Brune、Pierre-Yves Renard
DOI:10.1039/c1cc16562c
日期:——
A general and single-step access to polysubstituted 3-hydroxypyridine scaffolds via hetero-DielsâAlder (HDA) reactions between readily prepared 5-ethoxyoxazoles and dienophiles is reported. The HDA reaction, run in the presence of Nd(OTf)3 at room temperature, was successfully applied to various 5-ethoxyoxazoles showing good functional group tolerance, and led to a straightforward process to obtain useful building-blocks.
报告了一种通过5-乙氧基噁唑与亲双烯体之间的杂Diels-Alder(HDA)反应,一步合成多取代3-羟基吡啶骨架的通用方法。在室温下使用Nd(OTf)3作为催化剂的HDA反应,已成功应用于各种5-乙氧基噁唑,表现出良好的官能团耐受性,并实现了直接合成有用砌块的简便过程。