Synthesis of Trisubstituted Pyridines<i>via</i>Chemoselective Suzuki-Miyaura Coupling of 3,5- and 4,6-Dibromo-2-tosyloxypyridines
作者:Cho-Hee Park、Yong-Ju Kwon、In-Young Oh、Won-Suk Kim
DOI:10.1002/adsc.201600950
日期:2017.1.4
diarylpyridine derivatives obtained was accomplished for the synthesis of novel and biologically relevant trisubstituted pyridines. The formal synthesis of ficuseptine, a bioactive alkaloid, has also been achieved via the palladium‐catalyzed cross‐coupling reaction of 3,5‐dibromo‐2‐tosyloxypyridine in 5 steps from 3,5‐dibromo‐2‐hydroxypyridine with 50% overall yield.
已经研究了对3,5-和4,6-二溴-2-甲苯磺酰氧吡啶的化学选择性Suzuki-Miyaura反应,用于制备三取代的吡啶。优化的条件使得可以轻松获得3,5-和4,6-二芳基-2-甲苯磺酰氧吡啶,产率为8%至99%。进一步的功能化,如钯催化的胺化反应和所获得的二芳基吡啶衍生物中甲苯磺酸酯基团的无铜Sonogashira反应,可用于合成新型的和生物学上相关的三取代的吡啶。通过3,5-二溴-2-甲苯磺酰氧基吡啶在3,5-二溴-2-羟基吡啶的5个步骤中钯催化的交叉偶联反应也已完成了具有生物活性的生物碱生物碱的正式合成。屈服。