Widely Exploited, Yet Unreported: Regiocontrolled Synthesis and the Suzuki-Miyaura Reactions of Bromooxazole Building Blocks
作者:Vitalii V. Solomin、Dmytro S. Radchenko、Evgeniy Y. Slobodyanyuk、Oleksandr V. Geraschenko、Bohdan V. Vashchenko、Oleksandr O. Grygorenko
DOI:10.1002/ejoc.201900032
日期:2019.5.15
An approach to synthesis of all isomeric bromooxazoles was optimized and its scope was extended to all three isomeric parents, as well as various alkyl‐ and aryl‐substituted bromooxazoles. The direct regiocontrolled lithiation followed by reaction with electrophilic bromine source was common and led exclusively to the target substituted 2‐, 4‐, and 5‐bromooxazoles on multigram scale. The utility of
优化了所有异构体溴恶唑的合成方法,并将其范围扩展到所有三个异构体母体,以及各种烷基和芳基取代的溴恶唑。直接区位控制的锂化反应,随后与亲电溴源反应是很常见的现象,并且仅在毫克数范围内导致目标取代的2-,4-和5-溴恶唑。在平行合成条件下,Suzuki-Miyaura交叉偶联反应证明了在这项工作中获得的多功能构建基块的效用。