作者:Maiko Hamada、Masatoshi Kiuchi、Kunitomo Adachi
DOI:10.1055/s-2007-983721
日期:2007.7
A practical and concise synthesis of KRP-203 (1) was achieved by utilizing a palladium coupling reaction mediated by XantPhos and Pd2(dba)3 as the key step. The coupling reaction of aryl bromide 5 with 3-hydroxythiophenol (6) proceeded chemoselectively to give phenol 7 in spite of the presence of a chlorine substituent on 5 and a hydroxyl group on 6. Phenol 7 was converted into KRP-203 by benzylation and removal of the protecting groups in high yield.
利用 XantPhos 和 Pd2(dba)3 介导的钯偶联反应作为关键步骤,实现了 KRP-203 (1) 的实用简洁合成。芳基溴 5 与 3-羟基苯硫酚(6)的偶联反应以化学选择性方式进行,生成苯酚 7,尽管 5 上存在一个氯取代基,6 上存在一个羟基。通过苄基化和去除保护基团,苯酚 7 可以高产率地转化为 KRP-203。