Synthesis of 2-amino-3-hydroxy-4-substituted pyridines via regioselective metalation of 3-(1-ethylpropyl)-[1,3]oxazolo[4,5-b]pyridin-2(3H)-one and application to corticotropin releasing factor1 receptor ligands
作者:Richard A. Hartz、Kausik K. Nanda、Charles L. Ingalls
DOI:10.1016/j.tetlet.2005.01.067
日期:2005.3
efficient route to the preparation of 2-amino-3-hydroxy-4-substituted pyridines is described. The key step involves the regioselective metalation and subsequent alkylation of the [1,3]oxazolo[4,5-b]pyridin-2(3H)-one ring system. Base hydrolysis provides access to a variety of 4-substituted pyridines. This chemistry is proved to be useful for the synthesis of corticotropin releasing factor1 receptor
描述了制备2-氨基-3-羟基-4-取代的吡啶的有效途径。关键步骤涉及[1,3]恶唑并[4,5 - b ]吡啶-2(3 H)-单环系统的区域选择性金属化和随后的烷基化。碱水解提供了获得各种4-取代的吡啶的途径。已证明该化学方法可用于合成促肾上腺皮质激素释放因子1受体配体。