Efficient Synthesis of Novel NK<sub>1</sub> Receptor Antagonists: Selective 1,4-Addition of Grignard Reagents to 6-Chloronicotinic Acid Derivatives
作者:Fabienne Hoffmann-Emery、Hans Hilpert、Michelangelo Scalone、Pius Waldmeier
DOI:10.1021/jo0523666
日期:2006.3.1
rearrangement followed by reduction. Furthermore, a new high-yielding synthesis of 2-(3,5-bistrifluoromethylphenyl)-2-methyl propionic acid based on the carbonylation of the tertiary alcohol obtained by Grignard addition of 3,5-bis(trifluoromethyl)bromobenzene to acetone was established.
描述了从6-氯烟酸开始的两类新型NK 1受体拮抗剂的新有效合成方法,其中包括befetupitant和netupitant。o的介绍吡啶环C(4)上的甲苯基取代基是通过对6-氯烟酸或其衍生物的一锅选择性1,4-格里雅加成/氧化序列实现的。检查了该添加/氧化顺序的范围。还表明,可以通过霍夫曼重排然后还原将羧基官能团转化为甲基氨基。此外,建立了一种新的高产率合成2-(3,5-双三氟甲基苯基)-2-甲基丙酸的方法,该方法是通过将3,5-双(三氟甲基)溴苯加到丙酮中而获得的叔醇羰基化而合成的。 。