Iodoindazoles with Selective Magnesiation at Position 3: A Route to Highly Functionalized Indazoles
作者:Bao Vy Lam、Yohann Berhault、Silvia Stiebing、Christine Fossey、Thomas Cailly、Valérie Collot、Frédéric Fabis
DOI:10.1002/chem.201504828
日期:2016.3.18
unique route to highly functionalized indazoles is described. A regioselective magnesiation at position 3 of 4‐, 5‐, 6‐ and 7‐iodo‐2‐THP‐indazoles (THP=tetrahydropyranyl) has been developed using TMPMgCl⋅LiCl (TMP=2,2,6,6‐tetramethylpiperidyl). The obtained magnesiate can be trapped by different electrophiles to introduce a wide range of functional groups including halogens, thioalkyls, alcohols, aldehydes
描述了获得高度官能化的吲唑的独特途径。在4- 3位置A的区域选择性镁化,5-,6-和7-碘-2- THP吲唑(THP =四氢吡喃基),使用TMPMgCl已经开发⋅的LiCl(TMP = 2,2,6,6-四甲基哌啶) 。所获得的镁盐可以被不同的亲电试剂捕获,从而在3位上引入各种官能团,包括卤素,硫代烷基,醇,醛,酮,酰胺或酯。一旦该位置被官能化,碘原子就可以进一步通过金属-卤素交换或交叉耦合策略。最后,N取代反应可以合成多种高度官能化的吲唑,从而通过简单而独特的途径获得这些有价值的支架。